Set the gap at one-eighth to one-quarter of one piece's width, measured edge to edge, and treat the two pieces as one block from that point on. So how much space goes between two pieces of wall art that are 9.4 in (24 cm) wide? Between 1.2 in (3 cm) and 2.4 in (6 cm), and I mark 2 in (5 cm) before I drill.
Two things override that range. The gap can never be narrower than the pieces are deep, or the side shadow falls on the neighbor. And the gap has to be smaller than the clear wall left outside the pair, or the two pieces read as separate hangings that happen to share a wall.
The pair I measured for this is a Houseland capsule panel in Design A, 23.6 in (60 cm) tall and 9.4 in (24 cm) wide, beside a Design B panel at 22 in (56 cm) tall and 9.8 in (25 cm) wide. Both are 1.6 in (4 cm) deep and both hang on a single keyhole hanger. Different height, different width, real depth, one fixing each. That combination is exactly what a flat number cannot handle.

How much space goes between two pieces of wall art?
One-eighth of a single piece's width is the tight end and one-quarter is the wide end, so the gap scales with the art instead of staying fixed. Most pages answer with one flat number, usually 2 to 5 in (5 to 13 cm), which happens to work for a mid-size frame and falls apart on anything narrow or oversized.
| Width of one piece | Gap at one-eighth | Gap at one-quarter | What I mark |
|---|---|---|---|
| 9.4 in (24 cm), Design A panel | 1.2 in (3 cm) | 2.4 in (6 cm) | 2 in (5 cm) |
| 9.8 in (25 cm), Design B panel | 1.2 in (3.1 cm) | 2.5 in (6.3 cm) | 2 in (5 cm) |
| 12 in (30 cm) | 1.5 in (4 cm) | 3 in (7.5 cm) | 2.5 in (6 cm) |
| 16 in (40 cm) | 2 in (5 cm) | 4 in (10 cm) | 3 in (7.5 cm) |
| 24 in (60 cm) | 3 in (7.5 cm) | 6 in (15 cm) | 4 in (10 cm) |
| 36 in (90 cm) | 4.5 in (11 cm) | 9 in (23 cm) | 6 in (15 cm) |
There is a ceiling. Past about 6 in (15 cm) the eye stops grouping two pieces and starts counting them, which is why the 36 in (90 cm) row gets 6 in (15 cm) rather than the full quarter-width 9 in (23 cm). Below 1 in (2.5 cm) you get the opposite problem: the pieces touch visually and the gap turns into a dark line.
Do I measure the gap frame edge to frame edge, or center to center?
Edge to edge for the gap you look at, center to center for the holes you drill. Those are two different numbers and mixing them is the most common way a pair ends up crooked.
Here is the arithmetic on my two panels with a 2 in (5 cm) gap. The block measures 9.4 + 2 + 9.8 = 21.2 in (54 cm) wide. Half of that is 10.6 in (27 cm). Panel A's center line sits 5.9 in (15 cm) left of the block center and Panel B's sits 5.7 in (14.5 cm) right of it, because the panels differ in width by 0.4 in (1 cm). The two marks are not equidistant from the middle, and that catches people out every time.
The screw spacing is simpler: half of A's width, plus the gap, plus half of B's width. That is 4.7 + 2 + 4.9 = 11.6 in (29.5 cm) between the two fixings. Measure that once and the gap takes care of itself.
What if one piece is taller than the other, do I line up the tops, the bottoms or the centers?
Line up the centers. My two panels differ by 1.6 in (4 cm) in height, and centering splits that difference into 0.8 in (2 cm) at the top and 0.8 in (2 cm) at the bottom, which reads as deliberate rather than as a mistake.
Aligning the tops dumps the whole 1.6 in (4 cm) at the bottom, and the bottom is where you have a horizontal reference: a console top, a shelf, a headboard. Your eye measures the shorter piece against that line and finds it floating. Align the bottoms instead when there is a strong horizontal within about 12 in (30 cm) below, because then the surface itself becomes the baseline and the 1.6 in (4 cm) step lands up at the top where nothing competes with it. Whether the two pieces need to look alike at all is a separate question, and a pair can relate without matching as long as the geometry is consistent.
How wide should the two pieces be together compared with the furniture underneath?
Aim for the block to be about two-thirds the width of the furniture below it. My 21.2 in (54 cm) block suits a console around 32 in (81 cm) wide, and that is the number to check before you commit to a two-piece layout.
| Furniture width below | Two-thirds target for the art | What the 21.2 in (54 cm) pair does there |
|---|---|---|
| 30 in (76 cm) | 20 in (51 cm) | Runs 1.2 in (3 cm) wide, close enough to read as a match |
| 32 in (81 cm) | 21.3 in (54 cm) | Lands on target; this is where the pair belongs |
| 36 in (91 cm) | 24 in (61 cm) | Falls 2.8 in (7 cm) short, still readable but at the edge |
| 48 in (122 cm) | 32 in (81 cm) | Falls 10.8 in (27 cm) short; a third panel gets you to 32.2 in (82 cm) |
Put the same block over a 48 in (122 cm) sideboard and it wants roughly 32 in (81 cm) of art. Two 9.4 in (24 cm) panels cannot get there. Widening the gap to 13 in (33 cm) would span the distance and destroy the pair. A third panel does it properly: 3 × 9.4 in plus two 2 in gaps equals 32.2 in (82 cm), which lands on target. That is the point where odd or even stops being a style argument and becomes arithmetic you can check with a tape.

How do I mark two fixing points so both pieces finish level with each other?
Measure to the hook position, not to the top edge of the piece. A keyhole hanger sits some distance down from the top of the panel, and that drop is the number that decides where the screw goes.
- Mark the block center on the wall. Measure the furniture width, halve it, mark that point in pencil.
- Pick the shared center height. Sit where you actually sit, have someone hold both panels, and mark the height that looks right from there. Say it comes out at 42 in (107 cm).
- Mark 5.9 in (15 cm) left and 5.7 in (14.5 cm) right of the block center. Those are the panel center lines, not the screws yet.
- Work out each top edge. With centers at 42 in (107 cm), Panel A's top lands at 53.8 in (137 cm) and Panel B's at 53 in (135 cm).
- Measure the keyhole drop on each panel separately. Lay it face down, hook the tape on the top edge, read down to the top of the slot where the screw will bear.
- Subtract the drop from the top edge height. If Panel A's drop measures 2 in (5 cm), its screw goes at 51.8 in (132 cm).
- Drill, drive the included screw, and leave the head standing proud enough for the slot to drop over it.
- Hang both, then measure the gap at the top and again at the bottom. Two readings that match means the pair is square.
Skip step 5 and you get the classic failure: two perfectly level screws and two panels that finish at different heights, because the drop was not identical on both pieces.
How do I test the layout before I drill anything?
Cut paper to size, tape it up, and live with it overnight. Two rectangles at 9.4 × 23.6 in (24 × 60 cm) and 9.8 × 22 in (25 × 56 cm), spaced 2 in (5 cm) apart, tell you in five minutes what a filled hole tells you on a Saturday.
- Cut two paper rectangles, one at 9.4 × 23.6 in (24 × 60 cm) and one at 9.8 × 22 in (25 × 56 cm).
- Tape the first rectangle to the wall with painter's tape, which lifts off later without taking paint with it.
- Tape the second rectangle beside it with 2 in (5 cm) of bare wall between the two edges.
- Measure that gap again at the top and at the bottom, so the pair sits parallel instead of fanned.
- Mark the hanger point on each sheet in pencil, so the paper carries the drill spot and not just the outline.
- Leave both sheets up overnight.
- Look at them with the lights on. If the gap or the overall width is wrong, move paper rather than filling holes.
- Once it reads right, drill through the pencil mark on the paper, then pull the sheets down.
Does a piece with depth cast a side shadow that affects how far apart the pair should sit?
Yes, and the rule is simple: never let the gap be smaller than the piece is deep. My panels are 1.6 in (4 cm) deep with a matte, hand-applied stone texture that catches side light and holds a shadow, so a low raking light throws a band of shade off each panel.
Run the numbers together and depth wins here. One-eighth of 9.4 in gives 1.2 in (3 cm), which is less than the 1.6 in (4 cm) depth, so the floor moves up and 2 in (5 cm) becomes the working gap rather than the tight option. If your pieces are flat prints in slim frames, ignore this entirely and use the width rule. If they project 2 in (5 cm) or more, measure the depth first and let it set the minimum. Where the light comes from matters as much as the depth, and a piece that carries a shelf needs its own clear space around it for the same reason.
Should I set the gap with the light on or with it off?
With it on, at the brightness you will actually use. A hidden LED halo reads as part of the object, so the lit outline of the panel is wider than its 9.4 in (24 cm) of physical width, and a gap that looks clean in daylight can turn into one smear of glow after dark.
The remote controls color and brightness, which means the same pair has two different visual widths. Turned very low as a night light beside a bed, the halo barely extends and 2 in (5 cm) holds up. Turned up to wash a hallway after dark, the glow spreads and the two halos start to merge. Set the gap for the brighter setting, step back to where you will stand or sit, and if the two glows read as one, add width in 0.5 in (1 cm) steps until they separate. It is an accent glow rather than a room light, so you are judging edges, not brightness.


From the shop
Wall Mounted Vase with LED Backlight, Textured Capsule Panel and Shelf
Houseland all three designs are 1.6 in (4 cm) deep, which is where the 2 in (5 cm) gap in this article comes from, and each hangs on a keyhole hanger using one fixing. The Battery LED option runs cord free, so a wall with no socket nearby is still fair game.
View the capsule wall vase panel — plug-in or battery options & current priceDoes viewing distance change the gap, a hallway versus across a living room?
It does, in opposite directions. Close up the gap looks larger than it measures, so tighten it; from across a room the pair compresses, so open it up.
In a hallway you pass at 2 to 3 ft (60 to 90 cm), I go to the tight end of the range, which for these panels means the 1.6 in (4 cm) depth floor rather than the 1.2 in (3 cm) width figure. Measure your own hallway width before deciding, because a narrow run also limits how much wall you have. Across a living room at 10 ft (3 m) I use the wide end, 2.4 in (6 cm), because distance eats space between objects. Check it from the seat you use, not from the doorway. The same logic applies to sizing art in a tight span, and picking the right size for a wall between two windows starts with measuring the span rather than the art.
Should the gap between the two pieces be smaller than the space left around the outside of the pair?
Yes, and by a clear margin: keep the outside clear wall at twice the internal gap or more. With a 2 in (5 cm) gap, that means at least 4 in (10 cm) of empty wall between the block and a door frame, a light switch, or a corner.
Break that ratio and the pair fails in a specific way. If the gap between the pieces is 2 in (5 cm) but the corner sits 1 in (2.5 cm) off the outer edge, your eye groups the panel with the corner instead of with its partner. On a narrow strip beside a door with 30 in (76 cm) of usable wall, the 21.2 in (54 cm) block leaves 4.4 in (11 cm) each side, which clears the minimum with nothing to spare. Vertical stacking follows the same proportional thinking, and the reasoning behind spacing between two picture ledges transfers directly to two panels stacked one above the other.

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