2. Debov's illusion has two circles with equal areas, one surrounded by a big circle and the other by a small circle. The result is that the former is small and the latter is big. Quoting a dish on a plate, the same amount of food, looks a little different in different sizes, so people who open restaurants should work hard on the size of the plate and how to look at the atmosphere.
Kenezer's triangle illusion: We first think of triangles, but actually triangles don't exist at all, which creates the outline of our subjective imagination. This illusion was first discovered in 1900, but it has been a century now, but its secret has not been completely exposed.
4. Mueller leye county illusion: When I saw this in the problem sets of primary and junior high schools, I really didn't believe that these two lines were as long as the upper and lower lines. I would take a ruler to measure them. Indeed, they are two line segments of equal length. Because the arrow directions at both ends of the line segment are different, the line segment with the arrow inward is longer than the line segment with the arrow outward. Experiments show that this illusion is most obvious when the length of the line segment is 8 to 50 mm, but with the continuous increase of the length of the line segment, the illusion will decrease.
5. Arrow illusion: If two straight lines with the same length are added with two outward diagonals at both ends of one straight line and two inward diagonals at both ends of the other straight line, then we will think that the former looks much longer than the latter.
6. Motion illusion: When we look at a circle in the picture, we will feel that other circles are rotating, but these circles are actually static.