Angle Illusion

Since we will be touching on angles real soon, here's some picture of how angles can affect our visual judgement. Angles is useful in many different ways: designing the exterior of buildings, planning the interior design and even in photography.

Inner Angle

Which angle of the inner "V" is smaller?



Judd Illusion

Is the red dot closer to the left or to the right?




Ponzo Illusion

Which vertical strip is longer?




Muller-Lyer Illusion

Which horizontal line is longer? The red or the green?




Answers:
Inner Angle: The angles of both inner "V" are the same.
Judd Illusion: The red dot is exactly in the centre.
Ponzo Illusion: They are both the same size.
Muller-Lyer Illusion: Both horizontal lines are of the same length.

Pictures from: http://www.wyrmcorp.com/galleries/illusions/angles.shtml