Fred Guttfield's Bird Feeding Table

It's been created to increase the amount of birds visiting your garden. Birds soon get familiar to its swinging movements and come to the invitation. After a short feeding session its internal program starts a motor to shake softly the bird away.

In the following link you can see the whole process and the idea evolution from scratch.

http://fredguttfield.blogspot.com/2006/04/feeding-time.html