Herds could efficiently retrace their paths to their territories after long migrations. Pascoli's Ulysses leaves Ithaca to retrace his epic voyage rather than begin another. They retrace their route back to a cabin they recall passing. This allows lady beetles to retrace their footsteps to previously used hibernacula. More ants then retrace the shorter path, reinforcing the pheromone trail. Originally, visitors had to retrace their steps back to the entrance. Bread crumbs will enable drivers to retrace their steps. Stan and Amador retrace their steps to see how Joyce escaped. To recall, they retrace the route, "stop" at each locus, and "observe" the image. The remainder (the vertical blanking interval) allow for vertical synchronization and retrace. The purpose was simply to help retrace a surveyed line should that become necessary. Alby and Minho, the lead Runner, later retrace Ben's steps inside the Maze. They should never retrace an already effected cut. Later on, by consulting his code book, the user could retrace annotated and generated entries. This process occurs with all beams blanked, and is called the retrace.