A small (though rarely as small as a 1/2" x 1" thumb nail) perspective drawing usually in pencil to illustrate a moment onstage or detail of an object.
One example:
View attachment 4691
http://www.rfdesigns.org/sher.htm
[file]Image:Sher2.jpg|thumb[/file]
One example:
View attachment 4691
http://www.rfdesigns.org/sher.htm
[file]Image:Sher2.jpg|thumb[/file]