This 1904 comic by Gustave Verbeek (click to enlarge) is a sort of visual palindrome — the first six panels are presented conventionally, and then they’re displayed again in reverse order and upside down to compose the story’s second half. Even the written messages change their meaning: why big buns am mad u! becomes in pew we sung big hym, and so on. Only the captions beneath the first panels are discarded in the second half.