Here is an illusion of a different type.
I was talking to a friend of mine that has taken up coin collecting rather late in life. He figures it will be cheaper then getting married again. Anyways he went into a coin dealer he knows to talk shop and came across an interesting tidbit.
According to his coin dealer 1972 pennies are significantly more valuable than 1932 pennies.
Now I know that I am a layman and know absolutely nothing about this hobby but this doesn't seem right to me. Can any of you explain to me why this might be?
One answer that made sense to me can be found here.
The below item is composed of two solid pieces of wood. There are no holes in this block. If you grab the top piece and lift the bottom comes with it. I first saw this as the Visual Illusion of the month on Amos Storkey's site.
The top picture was pointed out to me by Rob of "What is it?" Rob's site has an array of pictures with the object being to guess what the object is in the picture.

All Rob has to say about this object is that it is the
Double dovetail puzzle
Amos presented the bottom picture with the following statement:
A craftsman took two solid pieces of wood, and carved them so they could be put together in the form illustrated below (the slight overhang is only used to illustrate the two parts). Each part is solid, and cannot be separated. The whole block is solid and has no spaces inside. The full cube could be lifted by picking up the top half.
How was this cube created (no adhesive used)?
I have pondered this puzzle since I saw it on Amos' site. It wasn't until today when Rob of
What is it? dropped me an e-mail did I decide to put some serious thought to this puzzle.
It took me a couple of minutes of thought then the answer hit me. I love this kind of puzzle. It works because we always make assumptions, it isn't until you throw those assumptions away that the answer reaches out and smacks you in the face.
Once the solution came to me I decided to include the photo from Amos' site . The bottom photo is a blatant clue on how this puzzle is done. You might as well show the construction blueprint.
Let's see who is the first person to comment correctly on this puzzle.
Good luck!
Here is another illusion. I have seen it presented as a puzzle or math problem but commonsense tells us that this must be an illusion. The only thing we have to do is try and explain the illusion.

Click on the Picture for the explanation
Below are 4 annoying questions, at least I consider them annoying because I fell into every trap! These are from an E-mail message that's making the rounds, so you may have seen them before.
Answer the questions instantly. You can't take your time. It's fun.
No pencil or paper! OK? Ready? ... GO!!!
FIRST QUESTION: You are participating in a race. You overtake the second person. What position are you in?
ANSWER
To answer the second question, don't take as much time as you took for the first question. (You know you took too much time.)
SECOND QUESTION: If you overtake the last person, then you are...?
ANSWER
THIRD QUESTION: Very tricky math! Note This must be done in your head only. Do NOT use paper and pencil or a calculator. Try it.
Take 1000 and add 40 to it.
Now add another 1000.
Now add 30.
Add another 1000.
Now add 20.
Now add another 1000.
Now add 10.
What is the total?
ANSWER
LAST QUESTION: Mary's father has five daughters Nana, Nene, Nini, Nono. What is the name of the fifth daughter?
ANSWER
Here we have an animated gif file. If you look closely you can count 12 little people. After the gif slides the image around you end up with 13 little people. How does this happen? I saw the same optical illusion done once with solid colored rectangles, the rectangle one is easy to see what happens, but this one is much more difficult because it is people.
If your brain starts to seize up and you must have an answer then click on the picture and it will take you to laurenceholbrook.com where they devote a lot of words and images to making this possible to understand.
Here is an illusion of a different type.
I was talking to a friend of mine that has taken up coin collecting rather late in life. He figures it will be cheaper then getting married again. Anyways he went into a coin dealer he knows to talk shop and came across an interesting tidbit.
According to his coin dealer 1972 pennies are significantly more valuable than 1932 pennies.
Now I know that I am a layman and know absolutely nothing about this hobby but this doesn't seem right to me. Can any of you explain to me why this might be?
via Dick Larkin's Motivational & Marketing Moment
Well, it's because
1,972 pennies is worth $19.72
But
1,932 pennies are only worth $19.32
This is another example how we bring our own preconceptions into everything we do. Here many of us saw the image of the penny and the date on the penny and automatically assumed that we were talking about the years 1972 and 1932.