Utopia regained in some way or other. One way might be a quest for an "earthly paradise"—a place like Shangri-La, hidden in the Tibetan mountains and described by James Hilton in his utopian novel "Lost Horizon" (1933). Christopher Columbus followed directly in this tradition in his belief that he had found the Garden of Eden when, towards the end of the 15th century, he first encountered the New World and its indigenous inhabitants. Utopia A utopia ( ) is an imagined community or society that possesses highly desirable or nearly perfect qualities for its citizens. The opposite of a utopia is
S-expression be formatted as pretty printed S-expressions using the function PPRINT (note: with two Ps, short for "pretty"-print). Lisp programs are valid s-expressions, but not all s-expressions are valid Lisp programs. codice_21 is a valid s-expression, but not a valid Lisp program, since Lisp uses prefix notation and a floating point number (here 1.0) is not valid as an operation (the first element of the expression). An S-expression preceded by a single quotation mark, as in codice_22, is syntactic sugar for a quoted S-expression, in this case codice_23. S-Expressions are often compared to XML, a key difference being that S-Expressions are