Christopher Pearson "Environment sensitive wallpaper"

For many wallpaper designers and artists, William Morris has been a huge influence. This is clear with artist Christopher Pearson and his piece "Environment sensitive wallpaper". This design is almost a replica of Morris's "Willow Boughs" 1887, with the same repeats and very similar colours. However, the wallpaper pattern is created in a way so that it reacts with UV exposure and the temperature in the room that it is displayed in. The effect is that the pattern develops 'naturally' over time the more exposure it gets; and appears to grow and spread over the paper. Presumably this is done using heat and light sensitive paper or paint but there is little information given about this.
The fact that it's reactants are heat and UV exposure poses questions on the wider environment and the effects we have on the planet and the environments we live in.

I would like to find out more about the technical methods the artist has used as it would be very useful for me to use as a method of conveying my own wallpaper designs and ideas on horticultural patterns.