This idea came up with James George at Detroit´s oF DevCon 2012. It consist on a set of connecting boxes that let you load and processes different type of data on the GPU. It´s designed to be flexible and visualy minimalist for quick editing on life performances. Also it's very handy for graphical debugging, editing GLSL Shaders on the fly, and as a ofxGui complement.
Check out the code at: https://github.com/patriciogonzalezvivo/ofxComposer