I scratched my head, "Was he the first artist to show brushstrokes?"

"Nah--the Impressionists had already shocked people by refusing to smooth out their brushstrokes. For centuries before them, though, many artists strived to create smooth, perfect canvasses with no evidence of a brush. But this artist's brushstrokes are as recognizable as his signature."

Trish whipped out several postcards and held them up:

"So which of these brushstrokes were made by the same artist?"