I wonder who actually built those in the Stone Age!
Maybe he thinks the toilet is such a fantastic technical phenomenon that it must be a deity.
Hahaha, that should be it. I almost can see the text balloon floating above his head, filled with question markes while he is worshipping this godlike invention.
Who build this gnome? Well, to answer this seriously, I think Homo Neanderthalensis, because this one really doesn't look like a Homo Sapiens to me.
Take a look at his nose, and his high and flat forehead. A typical Neanderthaler to me.