From Puck's Broom by E. Gordon Browne and illustrated by Kathleen I. Nixon, 1923.

From Artful Anticks by Oliver Herford (1894).

From Christopher Cricket On Cats by Anthony Henderson Euwer, 1909.

INSTRUCTIONS: Shift between variations of the book cover. From Mystery in the Desert by Jack Woolgar.

From Ashland College's 1931 yearbook.

Weirdly, though the title promises twice 55 songs, the book contains 116 songs.  From Twice 55 Community Songs, 1924.

From Jurisprudence by Francis P. LeBuffe, 1938.

INSTRUCTIONS: Click to shift to the cover. From The Ghost of Five Owl Farm by Mary Q. Steele.

INSTRUCTIONS: Click to shift to the cover.

From The Personality of the Horse by Brandt Aymar and Edward Sagarin.

The completed Tic-Tac-Toe grid on this book cover communicates a poem when the X's and O's are read as one-letter words. 

Using our "X-O-Skeleton Story Generator," we can read the grid as: "Choosing gladness, reassurance; capturing pains incorrect; eye magnifying the sun."

The book cover is from Invent Your Own Computer Games by Fred D'Ignazio.

From Midnight Prowlers by Phyllis Fenner.

From This Their Dreaming: Legends of the Panels of Aboriginal Art in the Yirrkala Church by Anne Wells.

INSTRUCTIONS: Click to shift to the title page.

From Star Bright by Paul Witty, 1969.

INSTRUCTIONS: Click to shift to chapter 3. From The Lost Americans by Frank Hibben.

You've seen the comedic trope of a person pretending to read, with the book upside down.  But sometimes that's the correct orientation, as with Accident by Ross Hamilton and More Curious by Sean Wilsey.

From Swarthmore College's 1962 yearbook.

From Ranch of a Thousand Horns by Jean Bothwell and Phyllis Sowers.