A Golden Tessellation of Quadrilaterals

In this tessellation, golden rectangles are shown in yellow. The orange darts are each made of two golden gnomons, joined at a leg — while the blue rhombi are each made of two golden triangles, sharing a base.

A Rhombic Triacontahedron, Decorated with Geometric Artwork

To make this rotating .gif, I navigated to the rhombic triacontahedron in Stella 4d, and then loaded images onto its thirty faces, with the image being the one I blogged in the post right before this one. This program, Stella, has a free trial download you can get right here.

Yellowstone Bison Stops Traffic

The wildlife in Yellowstone National Park live there; the people are merely visitors. I stopped our car when I saw a bison (what some call buffalo) grazing by the side of the road; I wanted a good picture.

I certainly did not expect what happened next — the bison decided to calmly strut into traffic! He stayed there a while, too. In Yellowstone, the wildlife have the right-of-way.

I’m Walking on an Active Volcano at Yellowstone National Park

At the time my wife took this picture, I did not yet realize that we were walking around on an active volcano when we recently visited Yellowstone National Park. The outgassing behind me, which I had just walked through, should have clued me in, since it had a strong smell of hydrogen sulfide mixed with hydrochloric and sulfuric acids. At a gift shop, I found a book by Greg Briening called Super Volcano: The Ticking Time Bomb Beneath Yellowstone National Park. It explains the science of Yellowstone, and makes a strong case that the volcano that created Yellowstone will blow up again, possibly soon, with cataclysmic consequences worldwide.

Pictures of Delicate Arch, from Arches National Park

These pictures all include Delicate Arch, which I once painted, before first seeing it for real a few days ago. It’s the sandstone formation on the left.

We visited Arches N.P., in Utah, on our way to Yellowstone National Park. More vacation pictures are coming soon.