Where the rabbit goes round the tree, through the hole and round the tree, the Harper knot, the rabbit goes round the tree, through the hole, up the tree again, meets another rabbit coming the other way.
Normalno zeko ide oko stabla, kroz rupu i oko stabla. Kod čvora Harper, zeko ide oko stabla, kroz rupu, na stablo, i susreće drugog zeku iz suprotnog smjera.