Human computer interaction

''"I wanted to build a new human-computer interface that would take advantage of our abilities to grasp objects, move them around and understand the spatial relationships between them," Merrill says. "Many of these skills are underutilised."
...
The user initially arranges a sequence of "blank" pieces in a row, which is brought to life by touching the blanks with pieces representing different notes, or notes with special characteristics. Pieces can be tilted to alter their value - to raise or lower the volume, for example. The siftables communicate with the desktop computer, which plays back the sequence.'' [source]