How can the man go up all the time and come back to the same place over and over?

The red squares are the same color in the upper part
and in the lower part of the "X"

There are no gray spots at the corners of the squares.

The rows of black and white squares are all parallel.

Impossible Triangle.

Parallel lines at sunrise.

The center circles are both the same size.

The Vertical lines are both the same length.

There are only white circles at the intersections

All the bumps are identical.
The one in the lower right corner is upside-down,
The image to the right is rotating.

Wavy Squares? No!
The background of concentric circles makes the squares appear distorted.

Rotating Wheels
The circles appear to rotate when you move your head closer and further away from the screen while looking at the dot in the center. 

Warped Square?
There are no curved lines in this figure. 

Riddle:

How much dirt is in a hole 4ft deep and 2 ft wide?

Answer written backwards:   .eloh a ni trid on si erehT

How about some critical thinking?:

Can you draw a line through each one of these dots, without lifting your pencil, and by drawing only 4 lines? (This means that you can make only 3 turns.) You also can only go once through each dot...

How many prongs are on this fork?:

Figure this out!

Three guys in a hotel call room service and order two large pizzas. The delivery boy brings them up with a bill for exactly $30.00. Each guy gives him a $10.00 bill, and he leaves. (That's fact!) When he hands the $30.00 to the cashier, he is told a mistake was made. The bill was only $25.00, not $30.00. The cashier gives the delivery boy five $1.00 bills and tells him to take it back to the 3 guys who ordered the pizza. (That's fact!) On the way back to their room, the delivery boy has a thought...these guys did not give him a tip. He figures that since there is no way to split $5.00 evenly three ways anyhow, he will keep two dollars for himself and give them back three dollars. OK! So far so good! He knocks on the door and one fellow answers. He explains about a mix up in the bill, and hands he guy the three dollars, then departs with his two-dollar tip in his pocket. Now the fun begins! Remember $30-$25=$5 Right? $5-$3=$2 Right? So what's the problem? All is well, right? Not quite. Answer this: Each of the three guys originally gave $10.00 each. They each got back $1.00 in change. That means they paid $9.00 each, which times three is $27.00. The delivery boy kept $2.00 for a tip. $27.00 plus $2.00 equals $29.00. Where is the other dollar ??????????

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