


Perceptions
Perceptual Illusions 
Mach Bands:
edges enhanced Heidinger's brushes perception of polarization 
Several optical illusions are HERE.  
Misconceptions
General Index to Web pages Web site gateway: look for it. 
A pictorial fallacy:
subtler than it might seem 
The impossibility of this drawing was denied in a letter to the editor in Amer. J. Phys. The response from readers led to the editor insisting on a retraction from the letter writer.  
Five steps to a better view.  Scope (the whole
truth)
Relevance (sort variables) Math (proportionality) Logic (avoid contradiction) Tensor (beyond scalars) 


Arrange the athletes by size.  Fallacies of comparatives & superlatives 
MORE RUNNERS INTELLIGENCE 

The magic of the mind
by magician Jerry Andrus 
Variations on Nekkar Cube 
MAGIC OF THE MIND, 2001 PARADOX BOX 

Perception:
the importance of edges the role of motion 
The cat in the tulips:
a fun activity for children (and adults) 
CATS AND A FIRST STEROPSIS THE FIRST 

Mathematics: Eureka!
"Once you've seen it you can never again not see it." 
Many math problems have surprising keys to solution.  The squares could be all white. It they were, discovering the key would be more difficult  and it would better represent what mathematicians do.  
Mathematics:
"You can find magic in places you never thought to look." 
There's an elegant principle.
(but trial & error works well) 
It's six blocks, each 1X1X3 fitting into a box 3X3X3 with nothing sticking out.  
Mathematics:
"You can find magic in places you never thought to look." 
The same elegant principle.
Trial & error = frustration 
NOT WHAT IT SEEMS A CANTANKEROUS CUBE ONE PUZZLE AMONG MANY 

The deceptive cube.
{Mikusinski revisited} Make the solution disappear. 
Things are not always what they seem.  This version of the Mikusinski puzzle was designed to allow a magician to cause the solution to disappear.  
It's all in visualization.  Young children sometimes can do what their parents cannot. 
A TABLE FULL OF PUZZLES 

The Monty Hall problem.
Even mathematicians err; the answer is staring at you. 
"It's very easy to seduce us no matter how smart we are ... with things
about probability  because we tend to get them wrong."
Keith Devlin, on NPR 
2003 

The lottery:
"The shortest route to disaster is to stop looking once you found what you like." 
We tend to focus on the desirable  and blur the undesirable.
Desirable: one ticket

GULLIBLE'S TRAVAILS 