Does The Ball Fall Straight Down or Does it Zigzag?

Zigzag Curveball

Look directly at the ball and it falls straight down.
Look to the side and the ball zigzags down the screen.

Demo and comment: https://t.co/GWLoxO5lUl #Illusions #Illusion #PeripheralVisionIsCool pic.twitter.com/v5vDXX536N
— Arthur Shapiro (@agshapiro2) June 17, 2019

Take a look at this Zigzag Curveball illusion - is the ball falling down straight or does it zigzag down the screen?

The answer depends on whether you're looking at it straight on, or to the side.

Arthur Shapiro explains:

The ZigZag demo has two types of motion: spinning motion (which is luminance-defined) and dropping motion (which is contrast-defined). Central vision processes are capable of keeping these types of motion separate from each other. Peripheral vision seems to lack these processes, and that is one reason why perception in peripheral vision can seem so strange.

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It's interesting that despite this article having a subtle inference to 'billions of years,' that you not only refer to this area as having been Eden, but point out that its age is in line with the Biblical account of a global catastrophe (flood) about 4400 years ago.

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Big parts of Sahara are under sea level. I've always wondered what would happen if you'd put a sea there...
http://en.wikipedia.org/wiki/Qattara_Depression_Project

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The Sahara is NOT the world's largest desert as stated in this article. It is the world's largest HOT desert, but only the third largest desert, the first two being the antarctic and the arctic.

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If you took all the sand in North Africa and spread it out it would cover an area the size of the Sahara Desert.

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