Artist R▲has created the VIDEOBLAST_R which is a wrist-mounted device which allows the wearer to project pre-prepared artistic imagery on any surface. Animation is triggered by a Wii nunchuck controller and the whole thing is mounted on a rollerblade armguard. An Arduino holds the imagery and transmits them to a Raspberry Pi which then handles the output via a tiny projector. Sounds are also included and the unit is powered by a powerbank (which is the thing hidden up his sleeve). You can read more about the project at the artist’s website.