u/3-Libras

I've been wondering for some time on what I saw exactly 2 years ago. Boggles my mind to this day.

My mom was sitting on the couch right next to me. She got up off the couch and left the room.

The same exact spot she was sitting in as she gets up, I see a large blue geometrical sphere (~2 ft), inside of it was a small pink perfectly shaped diamond star in the center. It was ~50% semi-transparent. It stuck around for maybe about 30 seconds or so.

I got the impression the sphere appeared to be sentient but I have no idea what exactly I saw. Was it an aura? Energy? Has anyone seen something similar or knows what it might be?

Here's a rough rendition of what I saw: sphere