The soul orbs in Portal

The soul orbs in Portal - Person in Black Pants and Black Shoes Sitting on Brown Wooden Chair

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?






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Images: cottonbro, Marcus Aurelius, Ketut Subiyanto, Marcus Aurelius