The cardboard tree trunk
Since a towel wrapped around my feet and legs evoked such a sense of stability I thought that extending that stability to the entire torso would enhance the sensation but actually it had the opposite affect. I took a large cardboard box, scored it on the outside and wrapped around myself and a few others. The box wasn't snug so it didn't feel secure (one of my testers even fell over - like a tree falls). Even if it was snug I don't think it would have the same sensation unless our feet were grounded to the middle of the shins - making sure we wouldn't tip. But even then, it might not be necessary at all.
