Facts and theorems can be difficult to swallow. They often get gunked up in the throat, remain lodged in the esophagus, useless for nourishment or growth. But stories! Stories get gulped down with eagerness and along with them much useful knowledge is digested. Julia E. Diggins tells the compelling story of geometry in String, Straight-Edge, and Shadow. Written for children, it would be beneficial to anyone interested in learning geometry.
They used as a straightedge anything else with which they could draw a straight line.
They came to realize that shadows are the sun’s handwriting upon the earth to tell the
secrets of order in the universe.
I want you to understand
not what the multitude generally
means by this expression,
like the beauty of living beings
or of paintings representing them,
something alternatively rectilinear and circular,
and the surfaces and solids
which one can produce
from the rectilinear and circular
with compass, set square, and rule.
For these things are not like the others,
but are beautiful in themselves.