From the sculpture description:
Originally inspired by looking at ferns on a walk in the woods, "Spring" is a mechanical abstraction of the same unfurling action that occurs in fiddleheads. The title is a double-entendre referring also to the coiled spring-like shape that the sculpture assumes. In fact, in an earlier version of this piece, there was a coiled spring incorporated into the mechanism.
See more kinetic art by Chris Fitch on his web site.
[ Thanks Ellen and Dave! ]