### pen-down
pd
pen-erase
pe
pen-up
pu

#### pen-down
pen-erase
pen-up

The turtle changes modes between drawing lines, removing lines or neither. The lines will always be displayed on top of the patches and below the turtles. To change the color of the pen set the color of the turtle using `set color`.

Note: When a turtle's pen is down, all movement commands cause lines to be drawn, including jump, setxy, and move-to.

Note: These commands are equivalent to setting the turtle variable "pen-mode" to "down" , "up", and "erase".

Note: On Windows drawing and erasing a line might not erase every pixel.

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