Hat does this C declaration means

int (*(*)())()

>>6
A single line of Lisp isn't cryptic, but couple of such lines, plus abuse of recursion and lack of any form of syntax make it cryptic as whole.
I could understand Lisp if i forced myself, but this is like deciphering some Amazonian tribe intricate whistling language which you can't replicate at will despite whistling not being that complex.