I enjoyed a lot the las album. I agree, the album sounds still like tool. Personally, I didn’t wanted a big evolution on their sound. For that, I can listen to Puscifer or APC.
I was surprised as well when I listened to that song for the first time. I really like it.
A stool is a device made out of a plastic or wooden dish and usually 3 legs, sometimes 4. You can put your bum on it and have a moment of relax. Altough it is quite uncomfortable if compared to a chair or a sofa it is widely used in pubs and it is very cheap. You can even do it yourself!
Oh wait, you mean TOOL? It’s a prog rock band! Pretty good, IMHO!