This is one of my favorite Discworld books so far. I adore Terry's way of converting real-world technology to something that would be invented on the Disc - magical, explosive video film, painted by tiny imps in a picture-box. This whole book is so ethereal and dreamlike, rooted in the unreality of cinema. If you like film history, you'll get a kick out of it. If you don't like film history, you'll miss out on some of the jokes.