What I found weird in Lisp (and didn't even realize at first) is that foo and (foo) mean something different. I now understand it similarly to the way in s

What I found weird in Lisp (and didn't even realize at first) is that foo and (foo) mean something different. I now understand it similarly to the way in set theory x and {x} are different, but one is not used to the ordinary parenthesis symbol behaving in this way.