Pull up to expand, push them down to collapse; turn over and watch them cascade, then do it all over again!
This is not a typical nest-and-stack toy. The weirdly-shaped pieces can be stacked and arranged any way you want. But then, nest them together, pull up on the smallest, and let your jaw drop. The whole thing stretches into a tall, spiraling tower! Beautifully un-intuitive design inspires hours of tactile discovery. Expands to 22 inches.