Many more Robin pictures up on the gallery: August 15, September 11, and September 13.

September 13 needs some explanation, the green block vibrates when you pull on the foot of the frog on one face. Robin figured out that you need to pull it to make it vibrate, but he couldn’t get a good enough grip with his fingers, so he tried his teeth. And the sequencing:

Maybe I can pull this!

Progress

Farther

Success!