Last year I came across someone who produced certain basses that are... well, I cannot remember the details. But they have a very unconventional tuning and are meant to be played differently. There was a video on YouTube of a player playing this bass. He played serene music for a few minutes and would constantly adjust the tuning of the bass as he played.
If I remember correctly, the name of this bass starts with a Z or with an O or something of the sort. I cannot for the life of me remember what it's called. If you know what I'm talking about, you'll know its name