Tim is still expanding - now in three dimensions!

A small foam toy from 20 years ago, which is inside a gelatine tube. Pop it into hot water, the gelatine dissolves, and the foam creature appears!

Tim then explores balloons of various sizes.

Then tiny spheres that grow hugely when placed in water, and the process is reversible; let them dry out, and they shrink back to their original size.

A kite that Tim bought in Amsterdam - it starts as a flat, circular shape. Give it a little shake, and it pops open into a cylinder. An amazing mechanism...

Tim's top hat that collapses and then pops up when required.

An amazing tower made from playing cards.

Finally, the Hoberman Sphere, in different sizes and designs.