Does anyone know if there is anything out there that is like a LED display that shows the audio spectrum while playing music? Oh the lights

They make me warm and fuzzy inside. Or am I just making up things in my mind? lol.. I've seen ones with dolphins.. (might be something else.. but I can't seem to find much of them out there.) Thanks!
I've seen them in a couple of cars, they were battery powered and clipped on to one of the "fins" of the A/C vents. They just followed the bass of music and went up and down...looked like a toy you get from chinatown. It was pretty cool watching it match the music for like...the first 5 minutes though. Maybe you can find "real" ones somewhere!
As for me, all my group of friends hang their high school tassels on the rearview mirror (as a car accessory sorta thing).
It's going to stay hanging there until we get our college tassels! :]