Slides for the talks may be viewed here:
Talk1 Talk 2 Talk 3 Talk 4 Talk 5 Talk 6
In the following I publish the slides for the second meeting.
The first slide refers to a video of the rotating mask illusion. This may be seen here. The illustration provides one of the best examples of our convexity preference. The convexity preference arises because for millions of years humans lived on earth under the illumination of a single light source from above (the Sun); and had observed features on the Earth that were almost always convex (hills, mounds, trees, animals, huts etc.). These objects were illuminated on top and cast a shadow at the base. In absence of shadows to guide, humans tend to interpret the object as convex.
The checker-board illusion is demonstrated convincingly by a video that may be seen by clicking HERE.
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