In thomas nickles, what is it like to be a bat? We've talked, i think, about the merryex thought experiment. We talked about zombis. The idea is that you can explain all the physical features of the brain and the nervous system, but there's still this explanatory gap. And having concepts that are fuzzy is not controversial, right? So there is no necessary and sufficient condition for breakfast, is it? Is it the time of day? No, because you can have breakfast later in the day,. Does it require pancakes? Well, obviously not.