Shelf Builder
Give Spine a gap and a palette. It picks editions that fit, deterministically — the same inputs always fill the same shelf.
The gap
Constraints
Height
–
Palette
Filled0 mmof 400 mm
Fit error−400.0 mmoutside ±15 mm
Books0blue, green
Chosen from—candidates in range
Your gap, to scale0 / 400 mm · gap 400 mm
400 mm
Picked
0 editions
Nothing fits. Widen the height range or the palette.
Most thicknesses are estimated from page counts and can be 20–30% out. Measure the gap, then check the spines before you buy.