It is by no means a substitute for a real canvas and a brush, but allows for an exciting new way to interact with your tablet. After seeing a few masterpieces done simply with fingers and iOS painting applications, we are eagerly awaiting the first samples with these pseudo paintbrushes.
The guys from Joystickers, which came up with the "Flow" brush, need $10 000 to start it rolling off the belts, so they are taking in $20 or $30 "pledges" to see if they can meet this goal and put the paintbrush in production. If the sum is met, your card will be charged, and the Flow brush shipped to you. So far they have about $3000 + pledged, with 25 days to go. We are expecting other innovative stuff from them, after they graced us with the idea for the little joysticks that can be placed on your smartphone's screen for more tactile gaming.
source: Joystickers via Clove