Item: Glass Walls / Floors

Duplicate of the current Invisible Walls / Floors but with the "visibility" always on. Alternatively an option on the Invisible Walls / Floors that allows the "visibility" to be toggled to always on.

Can you also make the walls stackable.

 

Walls of glass have to be increasingly thick to not shatter on the impact of a ball, thrown stone of a human running into the wall. If water filled a huge glasstank has to have far thicker glass walls than a fish bowl, else things like this happen:

https://www.mdr.de/brisant/aquadom-berlin-aquarium-geplatzt-100.html

16 metres high aquarium before:

Spoiler

Large sheets of glass like nowadays were simply not known in the past. In medieval times the best were mosaics of small pieces of coloured glass kitted together for a larger window.

Using glass as a building material for walls of huge aquariums or buildings was first done after the industrial revolution for the Crystal Palace during victorian times so only feasible for a kobold steampunk setting
https://en.wikipedia.org/wiki/The_Crystal_Palace

Spoiler

 

They didn't have the advantage of a magical realm though where thigs link mosaics can be processed back into balls of clay. ;-)

If you prefer, name it as "Imbued Glass Walls / Floors" or "Hardened Glass Walls / Floors"

 

Invisible Aluminium?