The Glass World is an alternate reality that Salad Fingers accesses in "Glass Brother".
Overview[]
The Glass World is somewhat of a dimly lit sub-aquatic realm, which is an exact replica of presumably the world of Salad Fingers, judging by how he swam through the atmosphere. Though it could be possible that he was just floating through the thick and murky air.
It's always night, but there is neither a moon nor a sun. There's also strange white tendrils everywhere, which could possibly be vegetation. There’s also an upside-down replica of Salad Fingers' Home, and it can apparently modify his replica house of the Glass World, since when Salad Fingers vomits on the floor of his house, the replica house in the Glass World also has that vomit. The only known way to enter and exit the Glass World is by going through a surface that has a reflection (I.E, a spoon, a mirror, a puddle, etc.). Wherever you enter the Glass World through a reflection, it will bring you to the other side of that reflection. Also, those who are in the Glass world can access the other side through reflections, like Glass Brother did when he took his hand out of the mirror and kidnapped "Hubert Cumberdale", or also Glass Mother when she tried to attack Salad Fingers by sticking out her fingers.
Inhabitants[]
The Glass World doesn't have many people in it. We can only speculate that there are glass versions of every character in the series, but this is yet to be confirmed by David Firth. The main two are Glass Brother, and Glass Mother (and possibly a Glass Father who she mentioned).