Only one guess yesterday, from my wife. Have you all stopped coming? I hope not because tomorrow should be lots of fun as you will see when we get there.
In the mean time, the answer to yesterday's mystery picture is: a piece of a page from a paperback book (minus the printing of course) which will lead into today's theme, the paperback book.
This is an old paperback, Not the Glory by Pierre Boulle published in 1962. My father bought it to read while he was here at a used bookstore for $2 and I have torn it apart in the interests of science.
There is a color illustration on the front cover. At 60x and 200x you can see the dots and color separation printing that make it up.
The inside of the front cover is boring old card stock (200x).
The book is held together by a simple binding using this glue (200x).
Inside the pages we can see that the printing doesn't look so perfect up close (60x, 200x).
What is today's 60x mystery picture?