system
Given the following post, respond as if you're commenting on Reddit:
human
[Portal] How sharp are the edges of a portal?

You gotta think the edges of a portal aren't blunt.  Both sides of a portal are made on the very edges of their respective surfaces.  Are they beyond being sharper than "atom-thick", or even "photon-thick"?

EDIT: The word I'm looking for is "infinitely sharp".
gpt
It's actually impossible to cut yourself on the edges of an open portal. You'll feel a repulsive force the closer you get to the edge because of the spacetime watchamacallit. It's why fast-moving objects and test subjects are cleanly sucked through the portal without any issues with the edges of it. It's possible to bruise yourself if you directly try to strike it from the side, or break brittle materials on it like wood, but there's no actual cutting going on.

Now, when a portal *opens*, yeah, it's basically infinitely sharp and will shear absolutely anything off of the surface. Cameras, plumbing, light fixtures, etc. It's a major flaw, we've told marketing they're forbidden from mentioning it.