Expert Recommendation

Exploration Stage: Room of Fate
From: Conductor
Description: I heard you're collecting unbelievable items in order to open a box containing Martha's memories. Is that true? Try to find a Klein Bottle. Its surface never ends. You can only see it in four-dimensional space, of course, so to the naked eye it just looks like a bottle with two extra openings at the bottom and on the side. Why are you looking at me like that? I just know a lot about bottles, okay!
Completed: Congratulations you found the Klein Bottle! Its internal and external sides are the same. A fly crawling along its surface could get to the inside from the outside without going from one surface to another. I'm glad this thing turned out to be what you needed. I'm always happy to help.