There's a post on "What is Cuil Theory" about what 0 Cuil is:

"I propose 0 Cuil, or "absolute Cuil". 0 Cuil: I ask for a hamburger, you give me the epitome of all hamburgers, to the most subjective detail."

I propose quite the opposite. 0 Cuil should be the base reference of the Cuil system. As the theory states that One Cuil = One level of abstraction away from the reality of a situation, it follows that Zero Cuil = Zero levels of abstraction away from the reality of the situation. In essence, Zero Cuil *is* perceived reality. Zero Cuil is the Zero Vector. Zero Cuil is the Identity Matrix. Zero Cuil is (Reality)x(1).

"0 Cuil: You ask for a hamburger. I give you a hamburger."

Going further down the rabbit hole of negative Cuil, is where hyper-reality exists

"-1 Cuil: You ask for a hamburger. I ask you what you'd like on it. You say ketchup and pickles. I give you a hamburger with ketchup and pickles but no bun, because you didn't ask for it."