Turtle and Observer Command
setshown?-at xcor ycor boolean

Sets the visibility of the turtle xcor units in the x direction and ycor units in the y direction away from the caller to boolean.

Examples:

setshown?-at 1 1 true sets the visibility of the turtle one unit to the right and one unit above the caller to true.

Related commands:
shown? ht shown?-at setshown?-of setshown?-towards