Easy painting for relax
Paint by number
Paint by number or painting by numbers are kits having a board
on which light markings to indicate areas to paint,
and each area has a number and a corresponding numbered
paint to use. The kits come with little compartmentalised
boxes where the numbered colour pigments are stored.
The users are encouraged to wash the paintbrush every time
a new numbered colour is being used. The kits were invented,
developed and marketed in 1950 by Max S. Klein,
an engineer and owner of the Palmer Paint Company of Detroit,
Michigan, and Dan Robbins, a commercial artist.
When Palmer Paint introduced crayons to consumers,
they also posted images online for a "Crayon by Number"
version.
Learn more on Wikipedia