Neat. And cellulose would be a cheap material.
I remember playing with "memory wire" when I was a kid. Bend it out of shape, apply heat or electricity, and it resumes it's original shape.
Used to have a pair of memory metal spectacles, you could scrunch them up, sit on them, nothing would damage the frame - except a hot air gun would turn them into a pretzel (I was told).
Fascinating stuff, they made a glass house ventilator with a memmet sensor/actuator and I saw a prototype pump system that used the sun's heat and the cooler water to motivate it. Sterling engine worked better though.