## Exploring Visual Perception Phenomena (Images)

Exploring Visual Perception Phenomena

Before we explain visual perception we would like you to explore some visual perception phenomena.

You can also get a hands-on experience exploring those visual phenomena with java applets on the Visual and Auditory Illusions Website

## Full and Empty

Question: In all of these three illustrations you can make out a yellow triangle, even though the outlines are not drawn. Why do the triangles on each of the pictures differ from one another?

Solution and explanation: In all of these three illustrations you can make out a yellow triangle, even though the outlines are not drawn. The triangles seem to lie on a higher layer than the rest of the drawing. The different angles of the cut out sections of the circles let the forms seem to be straight, convex or concave.

## Lengths and Angles

Question: Is the line from A to B just as long as the line from A to C?

Solution and explanations: AB = AC. The perspective leads to a confusion in the perception of the lengths of the lines.

## Waves

Question: Do the squares lie in line with each other?

Solution and explanation: Yes, you can verify it with a ruler.

## Waves

Question: Are the orange lines straight?

Solution and explanation: Yes, the lines are straight and parallel to each other.

## The Effect of the Perspective

Question: Are both of the girls in the picture of the same size? Why does the delusion work?

Solution and explanations: The perspective leads to the delusion.

## Colors

Question: Are the inner squares all the same size?

Solution and explanation: Yes, but a strong colour in the background weakens the perception of the inner square and lets it seem to be smaller than it is.

## Hidden Pictures

Question: What can you see in this picture if you turn it upside down?

Solution and explanations: The duck turns to an island, the beak to a canoe and the head to a big fish.

## Hidden Pictures

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## Straight Lines

Question: Are the lines straight?

Solution and explanation: Yes, the lines are straight and parallel. The presence of the other lines and their directions mislead our perception.