
xkcd, Devotion To Duty 167
xkcd really hit the nail on the head today.
"
What determines the strip's shape is its differing areas of "energy density," they say.
"Energy density" means the stored, elastic energy that is contained in the strip as a result of the folding. Places where the strip is most bent have the highest energy density; conversely, places that are flat and unstressed by a fold have the least energy density.
I have never seen anything fill up a vacuum so fast and still suck. -- Rob Pike, on X.