What Gestalt principle is being used here?

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Presentation transcript:

What Gestalt principle is being used here?

WHAT IS AN ILLUSION? A perceptual misinterpretation of reality. Illusions are misperceptions of real sensory stimuli. There are more than 200 visual illusions.

FICTIONS When you perceive a shape that is not there We think we see edges even though there is no boundary line

AFTER EFFECTS When you look at something for a long time and then look away you see the opposite colours WHY? Because the receptor cells in the retina become tired if we stare at something for too long If RED cones get tired then GREEN cones spring into action (and vice versa) If BLUE cones get tired then YELLOW springs into action (and vice versa)

After-effects also work with motion too 1. Look at the cross 2. Now try and follow the green dot!

http://www.youtube.com/watch?feature=endscreen&v=oNhcpOIQCNs&NR=1 https://www.youtube.com/watch?v=MYJkM4wfyZI

GLOSSARY AMBIGUOUS FIGURE DISTORTION ILLUSION

AMBIGUOUS FIGURES Sometimes what we are looking at has more than one perspective We can only see one image at a time Swapping between the 2 images is hard to do – but not impossible

CAN YOU CHANGE DIRECTION?

DISTORTIONS You know what you are seeing is wrong They only work on paper When you can walk around it the illusion goes away Channel 4 is advertised this way http://www.youtube.com/watch?v=Xx8XsthXsSw&NR=1&feature=endscreen

What are illusions? Read pages 245-246 Briefly describe the Ames Room and explain how the illusion works If we watch a person walk from the back right-hand corner of the Ames Room to the back left-hand corner they appear to shrink. Why? Why is the observer’s view restricted to a monocular one? https://www.youtube.com/watch?v=Ttd0YjXF0no