Illusion quizes
since June 4, 2004; access since August 12, 2008
The fourth quiz
Which of the right line segments is aligned with the left one?
April 9, 2010
The third quiz
There is a girl different from the others. Which is it?
August 12, 2008
The second quiz
Which pair of squares are the same in luminance among a-d?
August 12, 2005
The first quiz
There is (are) color(s) that is (are) not used in the figure shown above. Which is (are) it (they), A, B or C?
June 4, 2004