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Below are some optical illusions you may find interesting. See how the lines are changing with simple addition of several other lines.
In this illusion, you should perceive the parallel lines as bending (even though they remain parallel).
In this illusion, you should perceive the separated diagonal line as having the right-hand segment above where a straight line segment should be.
In this illusion, you should perceive the two parallel lines as bending toward each other in the middle
In this illusion, when there is no square, you should perceive the red line as angled and the black line as horizontal. When there is a square, you should perceive the red line as horizontal and the black line as angled.
In this illusion, you should perceive the higher line as being wider than the lower line (even though both lines are the same width). In addition, if you stare at the illusion, when the solid bar is shown again, it may temporarily appear concaved.