cone oscillator
A seed cone from a Red Pine tree is mounted on a platform and oscillates through states of wetness and dryness, closing and opening. The cone closes when it is wet and opens when it is dry.
(via @vagueterrain)

cone oscillator

A seed cone from a Red Pine tree is mounted on a platform and oscillates through states of wetness and dryness, closing and opening. The cone closes when it is wet and opens when it is dry.

(via @vagueterrain)