The theme of this story concerns the idea that observation determines reality, and takes it to a more profound level than is usual in quantum mechanics. Along the way, the history of π and of four-dimensionality are discussed.

I am not qualified to comment on the math content - I accidentally fell into your site while looking for the author's name. This is a strange and fascinating place!

I read this story in the 1980s and still think about it from time to time. On first read I thought it was absolutely amazing and it stayed with me for a long time. I re-read it about 10 years later and it wasn't as good as I remembered it being. I am looking for it now to see what happens on third reading! So the Literary Quality score could change ...