Colour mixing has fascinated Jessica for quite a while now. It's a brilliant topic for experimentation and there are so many brilliant ways of playing with colours. We've particularly enjoyed using pipettes and liquid colours in the past. Today though, we just used a palette of watercolours and a brush. Jess used a crayon to repeatedly draw around a square tub and I encouraged her to overlap the shapes. She then painted each square with a different colour and was thrilled to find that the overlapping parts colour-mixed. Her preference for pinks and purples led to a somewhat less interesting image than we might otherwise have got but I really do try not to get too involved in these little projects.