Some time ago I wrote a totally crazy article about how I thought that the aliens from Villeneuve's "Arrival" had extra-sensory perception of manifold geometry: https://community.wolfram.com/groups/-/m/t/1034626 ( with over 13,000 views !? What? How can this be? ) Tonight it occurred to me that this theory could be improved and advanced by physical construction of a curved surface sculpture using wire and //black thread only//. It took more than ten yards of winding, but here it is: https://0x0.st/zO6H.JPG An Enso is supposed to be drawn in one fell swoop. This is not possible without ink... At the end of the process, leave extra thread, and it can be wrapped around cyclically for added texture, even in only one breath. Of course, in terms of topology, the sculpture is a an orientable annulus, with a 2*Pi cycle on either side. Seen this way, yes it's foolhardy to rush on to Mobius loops, Klein bottles, and anything else the Germans might have invented. And at last: "The creation of enso was continued by Daitoku-ji masters during the early Edo period (1600-1868) such as Takuan Soho (1573-1645) and Kosetsu Soryu (1595-166), and then became increasingly popular with Zen masters in the Hakuin lineage such as Torei Enji (1721-1792) and Shunso Joshu (1751-1839)" I found a picture of "Drunk on the Moon", by Dairyo, abbot number 341. Ha ha ha, me too, but don't forget Hotaru! Cheers --Brad