Try experimenting with different colours of ballpoint pen to create layers of texture. Light-coloured felt tips can easily pick up darker colours from a drawing surface. This can be avoided by ...

An ordinary ballpoint pen is held in a spring-loaded carrier ... which uses Canny edge detection to create an outline drawing, then fills in the empty bits to create bright and dark areas.

It’s a debate as old as time and has had the world’s finest intellectuals at war for years – what is better to write with, fountain pens or ballpoint pens? Okay, maybe it’s not that ...