The R-16 robot is a one cubic inch robot. It is capable of reacting to its environment with music wire whiskers.
It can move and explore the perimeter of a box or a room on its own. It can also be remote controlled using a Sony infrared remote control.
It has pre-programmed reaction patterns. It is an attempt to create a one cubic inch robot that does not use surface mount technology.
Go to the link to see schematic, a video, and Picaxe code.