I found the Python more readable even though I have written programs in Clojure and never written programs in Python. In fact I'd be willing to bet that Python-like syntax would be found to be more readable than Lisp-like syntax for programmers with N years of experience in that language, if such a study could be conducted. (ie, I'd bet that an average programmer with 5 years of Python experience and nothing else can correctly read programs faster than an average programmer with 5 years of Clojure experience and nothing else (not that the latter exists)).

True, but for instance I know neither Python nor Clojure, and yet Python looks more accessible on first glance - even though I have some experience with other LISPs.

I know Common Lisp well, thanks. Only dabbled with Clojure.