" Hopscotch is played with a pebble that you move with the tip of your toe. The things you need: a sidewalk, a pebble, a toe, and a pretty chalk drawing, preferably in colors. On top is Heaven, on the bottom is Earth, it’s very hard to get the pebble up to Heaven, you almost always miscalculate and the stone goes off the drawing. But little by little you start to get the knack of how to jump over the different squares (spiral hopscotch, rectangular hopscotch, fantasy hopscotch, not played very often) and then one day you learn how to leave Earth and make the pebble climb up into Heaven "

― Julio Cortázar , Hopscotch