This is a popular science book about geometry published by the OUP, and aiming at a level well bellow that of any subscriber to the hyperspace. It contains a chapter about geometry of space time, and another chapter about geometry of Renaissance art. It mentions twistor theory. Buy it for your children. Suggest it to libraries and donate copies if they are slow in purchasing.
More info: external linkContact: m.dunajski[AT]damtp.cam.ac.uk