A map I made in ~5 minutes.

This map demonstrates how to move a unit (Protoss Corsair) based on creating units at your Terran Barracks which either move your Protoss Corsair, left or right. The system similar to the one AngelFarto used in his Tron map, but this one works better.

How it works:
You star out moving down which is equal to a number
5 = Left
6 = Up
7 = Right
8 = Down

When you create a Terran Medic (Left) it adds 1 to a Death Counter.
When you create a Terran Marine (Right) it subtracts 1 from a Death Counter.

Now the whole reason why this system is better and easier to understand is because unlike Tron which uses a bunch of switches to determine what count is what direction, I just used numbers with a conversion system so when you get too high and you go beyond the 5-8 numbers it converts them into usable direction coordinates:

1-5-9 = Left
2-6-10 = Up
3-7-11 = Right
4-8-12 = Down

It uses two locations to form a " + " sign and moves detects where to move based on the Vulture Spider Mines placed around the outside of the map.

Special Features:

You can center your screen on the Protoss Corsair by making a Terran Ghost.
You can make a smoke trail by making a Terran Firebat.

Note: Both of these effects are turned off by creating the unit again.