Molyneaux’s Problem

"In 1688, John Locke received a letter from scientist William Molyneaux posing a curious philosophical riddle: Suppose a blind man learned to identify a cube and a sphere by touch. If the shapes were then laid before him and his vision restored, could he identify them by sight alone?"

Futility Closet has the answer

The Amazing Albert Maze

Think you're a genius? Find your way out of this one, Einstein.

Print out a copy of this page, get your scientific writing instrument & give it a try.

Link - Via Reality Carnival

Crayon Physics Deluxe

Crayon Physics Deluxe is a 2D physics puzzle game, in which you get to experience what it would be like if your drawings would be magically transformed into real physical objects. Solve
puzzles with your artistic vision and creative use of physics.

Thank you Moira.

The Puzzled Fox

I fancy foxes and liked the picture on its own; the puzzle is a bonus.

This 1872 Currier and Ives print is titled The Puzzled Fox: Find the Horse, Lamb, Wild Boar, Men's and Women's Faces. There are eight human and animal faces hidden in the scene. Can you find them?

Ironically, the birds in the upper left have now disappeared — they're passenger pigeons.

Menagerie via Futility Closet where you can find all sorts of puzzles and other neat stuff.