How a futuristic material is able to change its properties from soft to rigid, and back ag

In our everyday life, we are surrounded by objects that have properties enabling them to perform certain functions. Rigidity and softness enable an object to perform a specific function. These propoerties are seemingly opposing in nature, and one property cannot be traded for another.

For example, pillows are soft to provide the necessary cushioning and comfort. A rolling pin is rigid and round to be able to roll over dough. Once these objects are fabricated, those properties cannot be changed.