1) These two blocks are the same color.....
Skeptical? Put your finger over the line where the boxes meet.
2) Are the horizontal lines in this image parallel or do they slope down?
This is a popular, simple optical illusion that uses black and white effectively to confuse our perceptions of what we are seeing. Because we are trying to rationalise either the black vertical lines or white vertical lines, we cannot make sense of the untidiness of the columns and, to our eyes, the horizontal lines are sloping downwards. Our eyes naturally follow the powerful vertical lines. In fact, the horizontal lines themselves are perfectly straight and measuring them would prove that they do not slope down at all.
3) Impossible Triangle
Stare at the image and see if you can work out the triangle. The cubes have been projected as 3D objects very effectively here and colour has been used to trick us into seeing the triangle change shape and twist around on itself. Does it make sense? If you begin with the purple square and follow it down to the green and then the white (cover the black squares), it does behave like a triangle and the perspective is correct. It is only when you look at the black line of squares that the shape falters and the perspective changes.
4) Is it moving and shimmering?
Look at this illusion for a while and it will appear to be shimmering and moving. Also, follow the outermost groove and watch it change from a groove to a hump as you go around the wheel.
Stare at the object and see if it beings to move and shimmer. If you focus on the outermost groove, it will become projected as your eyes follow it around the wheel. This optical illusion, as the traditional spiral, is a popular way of tricking the mind. The black centre gives us a focal point, but when we fix upon it, the squiggly black and white lines behave erratically around it. Our brains cannot lock these down, as they grow smaller towards the centre, giving the illusion of perspective, and so in our minds they being to move and shimmer.
5) Do you think you can build that?
This type of optical illusion is very popular because it is a real puzzle for the brain. Can you see the cube and its structure clearly? Our brains tell us that the cube does not act like a cube, because the front and top do not make sense to us. We try to make the image behave as it should, but we cannot. The openings appear to be straightforward enough, but the structure where the points meet appears wrong to us and the shape of the cube changes because of this central point. It is a tricky and effective illusion.
Cool Source: http://illusions.org
