The tumbling blocks illusion: three tiles, one impossible cube

Stare at a tumbling blocks pattern for a few seconds and the cubes flip: what read as tops become bottoms, stacks become hollows, and then they flip back. It is the friendliest optical illusion in the decorative arts, and it is built from exactly three shapes.

How the trick works

Take a rhombus, a diamond with 60 and 120 degree corners. Lay three of them around a point and they form a hexagon that your brain insists on reading as a cube seen from a corner. Give each face a different tone, light on top, medium on one side, dark on the other, and the illusion locks in. Repeat, and the floor appears to be stacked with blocks.

A pattern with three lives

Quilters pieced it as “tumbling blocks” or “baby blocks” through the nineteenth century. Victorian tilers laid it in entrance halls where the light could rake across it. And makers keep coming back to it because it rewards exactly what mosaic does best: flat colour, sharp edges, dark lines between.

In the workshop

Our Tumbling Blocks Tray keeps the classic chocolate-tan-cream colourway. The Illusion and Cube Coasters shrink the trick to a single cube each, in six colourways, so you can stack a little tower of illusions by the kettle. All handmade in Cambridge and posted anywhere in the UK.