Why were there green Lumin discs above Borg regeneration alcoves and blue ones in random places in Star Trek Voyager? Meaning, did they have an in-universe explanation for them?
These things were popular in every novelty gift shop in the 1990's and can still be found on eBay and Alibaba for $10 - $30. Did someone from the production team just seem them and say "Hey, cool! Let's put those all over the place!" or is there some function they were supposed to be serving?