I started replaying Portal recently, and I noticed this blue orb floating in mid-air in the challenge #18.
I thought nothing of it at the time (apart from grabbing a screenshot). But a little later, when we find out that there is no "cake" to be had in the game, and the AI goes rogue; I noticed these orbs again.
Note that this time, there are 2 orbs floating and not one.
Are these orbs significant? I don't remember noticing these when I last played the game (some 6-8 years ago). Could this be a bug?
Best Answer
It seems that those orbs are indeed a bug from the game. Looking at this guide, it is explained how they are created:
It's possible to see blue and orange versions of those orbs, like you can see in the guide above. Some other people have been reporting about this bug, for instance in this Reddit thread: