Thanks to Pabloxid for sending in his dancing robot (translated into English). His movements reminds me a bit of Keepon.
“Its output devices are: the 2 DC motors at the base, the 3 servos that move the “head”, clusters of LEDs in the “eyes” and an audio system that plays both the internally generated beeps like sounds stored in a small flash drive, using a car MP3 player. His only sensor is a device developed in-house, which I called the “electronic eye”. It consists of an IR transmitter and 4 receivers arranged in a square, handled with software from within the Arduino, which can detect the presence of not only objects but also their movement.“