It reminded me of some game I played in school a long time ago. There was a little turtle in the center of the screen and you had to type long strings of commands. Something like F50, R35, F15, L45, etc... and then you'd hit enter or something like that and it would draw a pattern on screen based on the code. F=forward, R=turn right, L=left, blah blah blah... To say the memory is fuzzy is an understatement. But it was soemthing along those lines. I think. 
The programming language is called
Logo.
There were a number of programs that allowed you to draw on the screen or command a robot equipped with a plotter pen.
If you used an Apple ][, you were probably using this program. (Works in MESS)

I remember reading about Logo and "turtle graphics" in an old TRS-80 mag like 80 Micro, Feb 1983, pg 116
here and/or some other article that talked about controlling a "turtle" robot.
Scott