Excitement about the metaverse died down towards the start of 2023, its oxygen stolen by the arrival of Generative Pre-trained Transformers (GPTs) - astonishingly capable AI models. But the metaverse will be back: the tech giants (especially Apple and Meta) are still spending vast sums on its development. It is best understood as the internet in 3D, the application of extended reality, including virtual reality (VR), augmented reality (AR) and mixed reality (MR). These technologies are going to be enormously influential in every aspect of life, and perhaps most of all in education. There is no better guide to this exciting new world than Donald Clark, who has been at the cutting edge of education technology for over 35 years. Not only does he talk and write with deep expertise, but also engagingly and entertainingly. What fun!