Ray cat

''99% Invisible'' commissioned Emperor X to write a song for the episode which could serve as a potential work of ray cat folklore. Emperor X, a former science teacher, says he was told to make the song "so catchy and annoying that it might be handed down from generation to generation over a span of 10,000 years". He titled the resulting work "'''10,000-Year Earworm to Discourage Settlement Near Nuclear Waste Repositories (Don't Change Color, Kitty)'''" (sometimes referred to by just its subtitle), an earworm being a song that sticks in someone's head. The song has fast-paced, repetitive lyrics, beginning:

Don't change color, kitty. Keep your color, kitty. Stay that pretty gray. Don't change color, kitty. Keep your color, kitty. Keep sickness away.

''Dagens Nyheter'' in 2022 noted that the song had only 48,000 listens on Spotify; Emperor X grants that the song is "very unlikely" to ever be used for its ostensible purpose, but sees it as something that will make people think more about the issue of nuclear waste storage. Kate Golembiewski of ''Atlas Obscura'' referred to the song as a "bop" and Ariel Schwartz of ''Business Insider'' called it "catchy".

''99% Invisible'' (which is based in Oakland, California, United States) also sold T-shirts for a fictional baseball team, the Oakland Raycats.

In the 2015 documentary short "The Ray Cat Solution", French filmmaker Benjamin Huguet interviewed Fabbri, as well as Kielty of ''99% Invisible''. The film shows Fabbri listening to Emperor X's song and receiving an Oakland Raycats T-shirt. Provided by Wikipedia