Build: Sunflower

This sunflower in a put is in search of light. On power-on it makes a full turn to check which direction has the most light. Then turns itself into that direction. From then on follows the light: when it gets darker it rotates a bit further to the light. Check out the video https://www.youtube.com/watch?v=XszTeDV3ixE for a demo.

If only I was a better Lego builder: I would have a second motor that would close the petals at night.