The facility is a massive, sprawling underground complex where ponies spend their entire lives. All they have to do is follow its instructions: flip that switch, turn that dial, press that button.
But what does it do?
Tagged Dark for general bleakness.
Content warning: may be frustrating to those with a high need for cognitive closure. It's also just plain weird.
Thank you to SparklingTwilight for prereading.
Written for the Science Fiction Contest. (third place)