The topic of placing chests on shelves pops up regularly on these forums, so I thought I would write a short tutorial on how to do it.
Let’s start with an empty shelf on the wall:
As you can see, the game won’t let you place a chest on top of that shelf:
What you need to do is provide support for the chest by putting something underneath the shelf. In this case, I’ll put another chest:
Once you have the necessary support, the game will let you place the chest on the shelf:
And now you can delete the supporting item from underneath the shelf:
The chest stays on the shelf without losing support:
And that’s how you can place a chest on a shelf. Be advised that putting a chest on any placeable is a risk. Stability loss bugs don’t happen often, but they have happened to me several times over the years of playing, regardless of whether the chest was on a shelf, a table, or a carpet. If you really don’t want to risk losing what’s in the chest, put it on a ceiling or foundation.
EDIT: A few words for those who might be worried whether this is an exploit or not. Be advised that Funcom is the final arbiter on what is acceptable emergent gameplay, and what is an exploit. And even when they confirm which one it is, they can change their mind later and have been known to do so at least once. If you’re worried about being accused of using exploits and want to avoid it at all cost, don’t use this or any other advanced building technique.
That being said, the final product of this is that the chest receives its stability from the shelf, and the shelf receives its stability from the wall. There’s nothing floating unsupported in the air, or indeed any circumvention of stability logic. The only thing this technique circumvents is inability to place the chest due to insufficient surface area.
This is pretty much the same case as trying to place a shrine on a reduced surface area by adding foundations or ceilings to the side of your intended surface until the game lets you place the shrine, then removing those pieces after the shrine is placed. Another example is placing the map room first and then the pillars and walls around it, because you can’t do it the other way around.
If this is an exploit, then so are those techniques, and vice versa.