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
Sideways bike normal chain system cannot function, but Killian created a part that allows the rear cassette to cause the wheel to rotate even when turning, by having an intermediate piece that can transmit the power. Rather than using a normal saddle for a bike, the sideways bike uses a unicycle saddle to aid balance. The sizes of the wheels vary considerably between different sideways bikes in order for each bike to be adapted to its purposes correctly. Sideways bike The sideways bike is an invention, patented in 2005, by Michael Killian, a software engineer from Dublin. He was inspired by the