Heidi Fourie creates monotypes using paintbrushes and watercolour paint. In a 2017 interview, Fourie explains why she enjoys using watercolour on Perspex to create her monotypes: “The watercolour marks look different from how you expect them to look on soft absorbent paper as it would have acted differently directly on paper, which makes it intriguingly confusing to look at. The pigments are more malleable on the slippery Perspex surface. One can reactivate it by wetting it again. The colour quality is also different, perhaps richer as the pigments are more on the surface where with watercolour painting directly on paper, the pigments tend to draw deeper into the paper.”