Shape Assembly
A classic solid from Euclid's Elements is drawn with one face missing · pick the piece that completes the figure
About Shape Assembly
Shape Assembly shows a classic geometric solid · cube, pyramid, prism, octahedron · drawn in the standard isometric view with exactly one face removed. The gap is marked by a dashed outline; your job is to pick the detached piece that fits it.
The solids are the classical figures of Euclid’s Elements (c. 300 BC), and every round’s reveal cites the definition or proposition that constructs the solid you just repaired. Matching a detached face to its place trains mental rotation and the reading of 3-D structure from a flat drawing.
Every round is generated deterministically from a seed. Runs entirely in your browser and works offline as a Progressive Web App.
FAQ
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What am I supposed to do in Shape Assembly?
One face of the drawn solid is missing, shown as a dashed outline. Compare the detached piece options with the gap · its shape, lean and proportions · and tap the piece that completes the figure. -
Where do the shapes come from?
They are the classical solids of Euclid’s Elements (c. 300 BC): the cube, pyramid, prisms and octahedron. The reveal after each answer cites the exact definition or proposition. -
What skill does this train?
Spatial reasoning: reading a 3-D structure from a 2-D drawing, mentally rotating a detached face, and matching shape, orientation and proportion · the same skills technical drawings and geometry lessons build on.