This is a cat drinking pond that takes soda bottles (like coke, pepsi, etc) with a pco028 thread as a reservoir. The water level is kept constant without the need for permanent monitoring on your side.
All corners and edges are nicely rounded so your tippy-toe doesn't hurt itself - also it looks much better.
L**** the cat: "Yay, I can haz water *purr*"
Got inspired by the "pond for small animals", my thing is a complete redesign though.