D-touch
From Just Solve the File Format Problem
d-touch is a scheme for creating coded objects which can be arranged in ways that control software. The makers of this system have a downloadable drum-set program with PDF templates that can be cut and folded to create the rectangular-solid objects that can be used to control the program by putting them where a webcam can see them. Markers are able to have shapes and patterns that are meaningful to humans as well as computers.
