In some children’s books, nothing much happens. In Roberto Piumini’s Glowrushes (Pushkin Press, £9.99), it’s like this: a father, a great Turkish lord, hires an artist to paint his sick son’s rooms for his 11th birthday, and together the boy and the painter create walls of wondrous imaginary landscapes. It turns out that you don’t have to travel outside your own room to inhabit new worlds.