The Great Ball Contraption Wiki
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From The Great Ball Contraption Wiki

The location of the back of a GBC module is defined by Rules 3 and 4 of the standard. If you are facing a module such that its in-basket is on your left and the output is on your right, then the front of the module is nearest you and the back is furthest from you. The left side of the module is on your left and the right side of the module is on your right.