To figure out who I am, start by holding hands with my twin, then go up one floor and come back down. Then you'll have to take a deep breath and drop down three stories - you'll be fine if you don't hit your head on the beams! And finally, run back up one and come down two floors, and then go halfway down.
After you've done all that, you'll recognize me right away.
Who am I?
Hint (6 hours elapsed):
Drawing a picture of the path on paper, horizontally, may help.
What artistic medium could "steps" and "beams" be hinting at?