I started replaying Portal recently, and I noticed this blue orb floating in mid-air in the challenge #18.

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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.

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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?

  • They're the orbs that your portal gun shoots that make portals when they hit walls. Somehow they got stuck. It's just a bug. Commented Jan 13, 2017 at 3:54

1 Answer 1


It seems that those orbs are indeed a bug from the game. Looking at this guide, it is explained how they are created:

I came across this glitch completely by accident. These "orbs" don't do anything to you or your game and you can walk straight through them with no effect. If you have a slow computer or one that can't handle a lot of moving entities/animations, don't spawn too many. They'll slow down your framerate quite a bit. Other than that, these things just look cool!

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:

It's a Orange Portal bullet. This is definitly a bug. You actually shooted the Orange Portal 2 times on a material that not allow's that! So in the First stage comes the effect, and in stage 2 comes the static effect that destroys the Orange Portal and crashes the code. Then it will become static ;)

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