We can use stylus and fingers to draw on iPad, but if you want to experience traditional painting, the Flow paintbrush should be a better tool.
The Flow is designed by Anthony and Russ. As we can see from the images, the Flow doesn’t has much difference with a traditional paintbrush, but the unique paintbrush can be used on any mobile device with touch screen like iPad, iPhone, iPod touch, Android tablets, and more. All you need to do is swipe the Flow with actual bristles on the touch screen, the great artwork will present on your tablet, apparently you can also experience the enjoyment of traditional painting.
At present, the inventors are raising fund for the Flow paintbrush for touch screen on Kickstarter. Pledge $20 will let you own a Flow paintbrush. If you’re interested, jump to Kickstarter for more details.