Observational Sketching: Hone Your Artistic Skills by Learning How to Observe and Sketch Everyday Objects

Recursive Thinking: Hone your programming skills by learning to think recursively at will

How to Draw: Drawing and Sketching Objects Environments from Your Imagination

The Caldwell Objects and How to Observe Them (Astronomers' Observing Guides)

Letter Carving: Techniques & Projects to Hone Your Skills