This is a pretty basic fluid simulation, integrated with the Leap hardware and Vuo nodes. The custom fluid node the composition relies on, is available for download here: https://vuo.org/node/714
The fingertip positions derived from the Leap are represented as radial gradients, which serve as dynamic occluders for the fluid simulation.
Credit to Jaymie Strecker for editing the final version to be able to work correctly in Vuo.