A description of the Froebel Gifts and their relationship to play and early development. These were developed by Friedrich Froebel, who also gave us Kindergarten. Frank Lloyd Wright cited his play with Froebel Gifts in childhood as a major influence on his aesthetic.
This image is older than God by now, but since Elastic Press [link] has recently asked me to format this image for use as a book cover, I've done some more touch-ups to the background and I thought I'd share.
Example of an analytical drawing from a student. Note heavy use of line in place of shadow. Line is heavily worked - not singular or necessarily definitive. The shape is worked towards methodically and appears even appears transparent.