David Hockney is justifiably proud of his drawing skills. Like most artists of his generation, he underwent years of enforced practice at art school, drawing from the nude model. This left him with a ...

With regular felt pens, users are limited to the colors of the pens in a set. As you might have guessed, though, the Colorpik Pen is different – it can reproduce 16 million colors, which are scanned ...