Desire is the engine of function. Game is indeed the product of Eros, and self results in the play of Desire and Logic. Joy is act of measure collapsing upon itself.
On an 8 by 8 chessboard you have one single knight. It is in the bottom left square of the board. Can the knight touch down once, and only once, on all 64 squares to end up in the opposite corner? No! The knight already occupies one white square, leaving 63 squares left. That is an uneven number. When the knight moves, he always moves from a black square to a white or from a white square to a black. As the two opposing squares are white, it would require an even number of moves for the knight to land there.