wrap
WRAP
tells the turtle to enter wrap mode: From now on, if the turtle
is asked to move past the boundary of the graphics window, it
will "wrap around" and reappear at the opposite edge of the
window. The top edge wraps to the bottom edge, while the left
edge wraps to the right edge. (So the window is topologically
equivalent to a torus.) This is the turtle's initial mode.
Compare WINDOW and FENCE.