A Ladybird Book reference in the title for some of you of a certain age from a certain country. An exhibit at the National Railway Museum in York is a sectioned steam locomotive. One of the guides at the museum showed us the various stages of the process of turning coal and water into power for the loco. I hadn’t understood the process fully before (and probably still need some additional education to be honest) but having the side of the loco cut open to show the various processes and the flow of the steam really made it easier to understand. I was going to say visualise, but it isn’t really visualising when you are looking right at it!