This book does indeed contain a large number of mechanical movements, and some of them are just fascinating as you look at them and try to figure out how they work. A lot of them are just like 'So thats how they do that!' The biggest drawback, and I may be prejudiced as a mechanical tradesperson, is that some of the extremely interesting movements do not have enough detail. Other than this, a good way to lose yourself for a few hours at a time.