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 ...

In fact, it's not even a photo of a blob of paint. It's a colored-pencil drawing. CJ Hendry: I just kind of sit here and doodle around and just draw a little bit. Narrator: That's CJ Hendry.

The duo who call themselves DFT draw familiar objects like trainers, animals, and hands – while never taking their pens off the paper. The artists can spend months conceptualising a single project.