The History of Batman Symbol Makes me Batty

TheDoLittle at 9GAG posted this simple but fascinating picture (or scribble) entitled, "The History of Bats."  It is such a simple piece of art but yet it is so mesmerizing.  If you look close enough you can make-out various Batman symbols through the years.  Truly amazing.  I could not find the original artist, please let us know whom to give credit where credit is definitely due.