|Young Girl-Old Woman|
Do you see an old woman or a young lady?
Can you switch back and forth between them?
Hint - the young woman's nose is the old woman's eye. The young woman's jaw is the old woman's nose.
The Kanizsa triangle is the white triangle you see that isn't really there. It even appears brighter than the background.
Are the yellow lines in this image the same size?
The perspective added by the railroad lines makes the line in the front appear shorter.
Do you see a vase or a pair of faces?
Typically, we quickly establish which objects in a picture are the "figure" and which are the "ground" (or background), but in this image, the background and foreground are equally strong, making it difficult for our brains to tell which to focus on.
Do you see grey blobs at the intersections of the white lines?
This is not just a trick of your monitor. Even on paper, you'll see those grey blobs. If you focus on one intersection though, you should be able to tell its white.
Which soldier is the tallest?
Answer: They're all the same size. Even knowing this, I can't believe it.
Are the long lines parallel?
They are, but the short lines are at an angle which makes it appear that one end of the longer line is closer to the viewer, distorting our perception.
What I love about these illusions is that knowing about them doesn't make the illusion go away. I hope you enjoyed them as much as I do!