Here's a video of a prototype computer input output device which is designed like a paint brush. It has a built in video camera into the head of the brush which allows it to pick up "video textures" or still colors and textures. For example, they show the paint brush recording someone blinking their eye and then painting the eye blink texture on a computer screen canvas. It's hard to tell if the screen canvas is touch sensitive or not (I think it is) as it shows someone smudging one of the images with their finger. However, it's possible that the paint brush device just records itself drawing. It picks up all kinds of textures like this fur print off this hand bag and works exactly like a paint brush after that. Watch the video for a better visual explanation.