John Smith I wrote:
John Smith imagines a caveman shading a fire (newly developed
technology) with a palm frond, jumping in glee, pointing, and declaring,
"Look, I am modulating light! I just wonder what I can do with a
campfire and a blanket?"

Strangely enough, since the use of fire seems to
date back some 790,000 years, that "caveman" may
not have been a homo sapien.
--
73, Cecil http://www.w5dxp.com