The two books, on drawing & geometry, will develop mindfulness and wisdom in any practitioner who has generosity and self honesty.
The two books, on drawing & geometry, can be seen as generosity and self honesty applied to the reader himself. And an extensively illustrated Latin primer, too.
Proofs are the the hardest of all the Geometry skills.
Others will tell one that drawing is the hardest of all the visual art skills.
The art book author says that drawing an accurate portrait is the hardest of all the drawing skills.
For some, mindfulness of the heart is the hardest of all the body mindfulness skills.