Shape play!

Drag the shape to see underneath. Tap a flat face to count it once. The dots can find hidden faces too. We count flat faces separately from curved surfaces.

Roll: use Turn to change how a shape rests, then Push. Compare an upright cylinder with one on its side. A cone rolls in a circle; a torus rolls on its edge; a hemisphere rocks on its curved side.

Build: tap any shape to add it. Turn changes the top shape. The arrows move the top shape sideways. Try it gives loose shapes a gentle nudge to test the tower; Undo removes one shape. New clears the tower.

These are simplified demonstrations with equal-weight blocks. Real rolling and balance also depend on size, weight, and friction. Predict together, then try real classroom objects.