Glass Box

The Glass Box is above Ilsa's home.

Looks
The Glass Box is an all-glass room with torches along the top in a square formation. There is a bed, crafting table, and chest up there, as well. There is a hole in the wall. If you jump out of it, you land in the ocean.

the comments teach me minecraft :) (episode 2)
Ilsa is giving a tour of her modifications, then shows the "glass box" which she (in a sarcastic tone) said she knows is a creative name. She said that the Glass Box was made for if there's a monster in her house and she gets scared. She said she can also watch the sunset up there. She can just go up there and chill. Then, she jumps out of a hole in the side, saying it gives her vertigo.