Caravaggio's famous painting, The Conversion of St. Paul, is one of 250 masterpiece paintings featured in Masterpiece Cards.  These art history cards reproduce and explain famous paintings of the world, starting with Renaissance paintings and ending with Pop works of art.  Like this:

Caravaggio. The Conversion of St. Paul.  Oil on canvas, circa 1601.  7'6" x 5'7".  Cerasi Chapel in Santa Maria del Popolo, Rome.

 

When these famous paintings were created centuries ago, painters used references -- like Biblical and mythological ones - known to viewers.  Good art history teaches the historical, social and political contexts of works of art, making analysis of famous paintings meaningful.  And memorable. Like this one:

 

Laurie Schneider Adams, Art Across Time, 2nd Edition (New York: McGraw Hill, 2002).  Pages 675, 677.