It was the OUTLINE of an irregular shaped triangle, made up of bright red light, moving low in the sky.

It was sometime between 11pm and midnight. Exact date not known, but somewhere between August 2 thru the 5th of 2022.
I opened my front door, which faces west, and was placing my outgoing mail in the mailbox, when I looked across the street. There's a long commercial building across the street about 200+ feet away. The building, including the embankment, is about 3 stories high.
The OUTLINE of an intensely bright red triangle, made out of light, traveled above the building from west to south. It was not directly above the building. I'm not sure how far away it was, but the building's a good reference as to how relatively low it was in the sky. It appeared to be approx. 20 feet above the building (from my point of view) and could've been one mile to several miles away in distance.
Whatever this was, was "light" and was not a solid object.
It was significantly bright in the sky, almost like a large Christmas ornament, but in the shape of an irregular triangle. It was only an outline. Its inner area looked dark, like the sky. I watched as it moved from west to south (about 5 - 7 seconds) and was absolutely amazed at its striking color. My view was then blocked by a series of trees.
A week later (8/11) I phoned the Mpls./St. Paul airport and spoke with the Air Traffic Control tower. Inquired regarding the OUTLINE of a red triangle (made out of light) flying low in the sky and could this possibly be the tail of a large aircraft? They were not aware of anything fitting my description. Lights that light the tail are white, not red, and do not form a triangular outline.
I'm the only person who saw this. Unfortunately, there's no witnesses.