I had an idea for a low-cost stylus that could be used with any LCD display – a phone, tablet, laptop, even a TV – and yet would allow for exceedingly high-resolution drawing. The basic idea was to include a small camera – something that now costs very little – pointing at the screen, and use various cunning techniques to recognise the pixels at which it was pointing.
Nice reminiscing of Quentin about an idea he had 7 years ago. Quentin is an Inventor in the truest sense of the world, a living Gyro Gearloose. I had the pleasure of meeting him once, he really is an idea machine. You should subscribe to his blog.