I must have one of these

http://web.media.mit.edu/~kimiko/iobrush/

I/O Brush looks like a reg­u­lar phys­i­cal paint­brush but has a small video cam­era with lights and touch sen­sors embed­ded inside. Out­side of the draw­ing can­vas, the brush can pick up col­or, tex­ture, and move­ment of a brushed sur­face. On the can­vas, artists can draw with the spe­cial “ink” they just picked up from their imme­di­ate environment.