Infinity symbol in bookbinding to indicate that a book is printed on acid-free paper and will therefore be long-lasting. In modern mysticism, the infinity symbol has become identified with a variation of the ouroboros, an ancient image of a snake eating its own tail that has also come to symbolize the infinite, and the ouroboros is sometimes drawn in figure-eight form to reflect this identification, rather than in its more traditional circular form. In the works of Vladimir Nabokov, including "The Gift" and "Pale Fire", the figure-eight shape is used symbolically to refer to the Möbius strip and the infinite, for instance
The Sky Moves Sideways version of "The Sky Moves Sideways" which includes both "Prepare Yourself" and "Stars Die". A triple vinyl edition was also released in the same year, by Headspin Music record label, including a 7-inch single with two versions of the song "Men of Wood", the first was taken from "The Sky Moves Sideways" recording sessions and the 2000 mix was previously included in the "" compilation. A double vinyl edition was released in 2012 by Kscope. This vinyl edition features a new "anti-loudness" remaster which is closer to the natural dynamics of the original masters. The track list was the same