Polaroid Time-Zero SX-70 was my favorite film. After snapping a pix the image was slow to

emerge leaving the opportunity to move the emulsion layers, much like painting. The warmer

the air the more time to manipulate the image, at most twenty minutes. A wrong move and

the image became a smudge.  Exciting because the process was not in your complete control.

Once set, a second opportunity arose to use crayons, pastels, and pencils.