"Ordinarily we believe that other human beings are conscious, and almost everyone believes that other mammals and birds are conscious too. But people differ over whether fish are conscious, or insects, worms, and jellyfish. They are still more doubtful about whether onecelled animals like amoebae and paramecia have conscious experiences, even though such creatures react conspicuously to stimuli of various kinds. Most people believe that plants aren't conscious; and almost no one believes that rocks are conscious, or kleenex, or automobiles, or mountain lakes, or cigarettes. And to take another biological example, most of us would say, if we thought about it, that the individual cells of which our bodies are composed do not have any conscious experiences."
[Thomas Nagel , What does it all mean? p. 24]
I've got a questions to ask:
What does "if we thought about it" mean? Does it mean "In case of we thought about it"