Yes. Hence the quotes, I guess. But hyperspheres are convex and their projections are also convex. So it's not really appropriate either to say that they are "s

Yes. Hence the quotes, I guess. But hyperspheres are convex and their projections are also convex. So it's not really appropriate either to say that they are "spiky" as in https://news.ycombinator.com/item?id=29969613 https://news.ycombinator.com/item?id=29969613