This is an interactive Sensacell application. It's a sound and light toy that can be installed in public spaces. This is our first Sensacell piece. The first stop is an installation at the Garner Art Center in Garnerville, NY, October 14th and 15th. 
Sensacells come in two varieties, HSI and M-30s. These are HSIs which is the higher resolution. Being divided into 4 chicklets would allow one to space out the square a few inches appart, and offset at different heights, rather than place each right next to each other as shown here. The alternative would be to mount the tiles onto a single 1/2" 4'x8' piece of plexiglass. Each HSI tile is less than 6" square and has 6x6 LEDs and 4x4 sensors. The M-30 (not shown here) is less than 12" square and has 4x4 sensors and LEDs. They are sturdy and can be used for floors, walls and furniture. Yes a bar top would be great.
This is programmed this in Flash/AS3. Currently this has 9 sets of sound samples and four note image types.