Night-Webs of Four-Part Compound Eyes

3

This is the inverted-color version of the previous post.

Tessellation Using Four-Part Compound Eyes

TWO

To see a single four-part compound eye, look at the previous post.

 

Euclidean Construction of a Four-Part Compound Eye

one

North American Geographical Oddity

You’re standing on the mainland of North America — not on an island. From where you are, you can travel due East, and you’ll come to the Pacific Ocean. If you travel due West, however, you will come to the Atlantic Ocean. What’s more, this is true for a relatively large percentage of locations in the country where you are located — a greater percentage than would be the case for any other country on the North American continent, if there even are others.

In what country are you standing?

(Scroll down for the answer.)

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panama

You’re in Panama! Now, before anyone protests that Panama is in Central America, not North America, let me point out that Central America is part of the North American continent, just as Europe and India are part of the Eurasian continent. (Yes, I looked them up.)

A Great Dodecahedron with Peepholes

Compound of Dodeca and dual

If anyone is inside this polyhedron, they can see you!

Software credit:  see www.software3d.com/Stella.php.

A Polyhedron with 602 Faces and Icosidodecahedral Symmetry

602 faced Convex hull

I used Stella 4d:  Polyhedron Navigator to make this. You can try this program as a free trial download at www.software3d.com/Stella.php.