I made an infographic depicting every distinct possible symmetry of 2D periodic groups. There are 17 distinct symmetries, known as the Wallpaper groups. Here is a preview.
“Every 2D Periodic Symmetry”. You can find the full image on my flickr. Vector graphics available on request.
The king of all useless arguments
Arguments for the existence of God are, generally agreed, not very compelling, and irrelevant to any real political arguments associated religion. And the ontological argument is king of the junk heap, as it is especially unconvincing and irrelevant. The ontological argument attempts to prove God’s existence a priori, with all the certainty of a mathematical theorem. Most people would say this is overly ambitious, and doomed from the start.
The ontological argument presents a deep and enduring mystery: who actually says this stuff? Does anyone say this stuff? What’s their deal?
The number of people who advocate the ontological argument is nonzero, but it’s quite rare in practice. Let’s round down to zero and say nobody actually says this stuff. Theistic readers may proceed unthreatened, knowing that I’m talking about an argument that none of them actually advocate.
U4-30, designed by Kazutaka Naka
I folded this from someone else’s origami book, which was in Japanese. I don’t know why it’s called U4-30, although I know the “30” comes from the 30 sheets of paper it’s made from. Perhaps this is the sort of technical name you come up with when you’ve designed lots and lots of variants. Yes, it was an entire book of roses and floral balls (Origami Rose & Kusudama). It’s very nice, so I think it deserves an entire book of variants.
It’s a curler unit, meaning the units are attached by twisting them together. I used three slightly different shades of red, which gives it a subtle texture without creating contrast between the different units.