You stand on a towel because you're the sovereign. As a sovereign, you're too important to be getting your shoes dirty. Everywhere you go, you're standing on a towel — that's how people know you're the sovereign.

And it's not just any towel you stand on. To show that you're the sovereign, it has the symbol of a tater (てい) tot on it. The mighty, sovereign tater tot! That's how everyone knows it belongs to the sovereign.