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A Klein Bottle, 500 feet in the air and "exploded" to show structure. With a "viewing ring" around it.
NOTE: This is just to show mapping, there is nothing to do in the map other than look around. If you're not careful, you can easily fall, there are no invisible walls preventing it as I felt invisible walls would detract from the sense of height if you couldn't actually fall off. An invisible walkway leads from the quest chest "into" the bottle, directly behind where the player starts, but out of view distance from the Klein Bottle. Clickies just outside the ring allows you to delete each side of the viewing ring. There is a teleporter near the quest chest that will allow you to teleport to ground level. It's not perfectly symmetrical, I knocked it together in 90 minutes or so just to do it. I chose to use ice boulders over rock boulders in case Cryptic ever makes them translucent, as the effect would look good (plus orange and blue look good together).