It's got a guitar and an amp connected through a chain of 96 effects pedals. People walk across the pedalboard, randomly changing which ones are on or off, causing shifts in the sound produced. I guess it's kind of an ambient thing - I'm not sure if you're supposed/allowed to play the guitar itself. Looks like there are looper pedals in the chain, so it can play pre-recorded sounds on its own for the effects to modify. At any rate, I think it's a cool idea.
It's an art instalation, it's not supposed to "do a thing". It's supposed to get the person who's appreciating immersed in the statement of the artist by transforming the envyronment or parts of it into the artistic statement itself.
The installation is called "Signal to noise ratio nightmare : thank f**k for buffered bypass". The same artist later produced a sister installation of a dog with a nerf gun as a statement about world peace.
The first pedal is a looper. A note or two or a chord or something is strummed and put on loop, then people walk across the pedalboard causing different effects to come in and out, obviously changing the sound.
