The fourth iteration of this marvellous digital app, the wild-child of the Escapemotions stable, has just arrived. Controlling it is harder than herding cats which at least go to sleep for several hours a day and generally pitch up for food, whereas this piece of kit with its multiple brushes, myriad within-brush settings, and huge palette, has the temperament of a bucking bronco. But, after chasing round the canvas for an hour or so, I’ve made a galaxy. Eat your heart out Professor Brian!