Manbearcat
Legend
First, can you give a reference in the current ruleset? If not this is a DM call.
I've seen this so often on these boards as of late? I thought 5e was the nostalgia/legacy/unification (except for 4e) edition? If that is the premise, shouldn't it be that it is assumed that standard, edition-spanning D&D tropes are carried forth? Do we need a citation for everything that isn't explicated in the DMG, PHB, or MM (because there is a lot that is not!)? I hope not.
Regardless, even if we do, we easily have that:
1) Wall of Force text: "Nothing can physically pass through the wall...<snip>...The wall also extends into the Ethereal Plane, blocking ethereal travel through the wall."
Coupled with the edition-spanning, legacy, is this not enough? No? Ok...
2) DMG 48 Ethereal Plane entry:
"...solid objects on the overlapped plane don't hamper the movement of a creature in the Border EthereaL The exceptions are certain magical effects (including anything made of magical force) and living beings."
I'm sure you're thankful for the legwork, so a gentlemanly "you're welcome" back to you.
Umm ... magic anyone? This is not a physical structure, it's a magical one.
No, it still doesn't make sense. If there is no floor, it cannot be dry if you place it on snow or on the open soil/bedrock when precipitation is ongoing. You'll have groundwater intrusion, melting snow, etc. Unless you have a magical force floor...which you do...
Second, the ghost sinks into the ground and comes up from underneath. Unless you give the hut a floor that it does not state that it has.
A hemisphere is literally half of a sphere. Half of a hollow sphere does not include a "floor".
It's a hollow hemisphere and does not state it has a floor. That's all the rules say ... feel free to add to the rules all you want.
Good to know you can derive intent of not only a fictional character, but the WOTC design team.
I presume you didn't follow the link. Ok, here it is. Jeremy Crawford's Twitter's clarification (of which he is talking to himself in the third person to make fun of himself for an erroneous statement - that being "there is no floor" - a few months prior):
"Leomund's tiny hut does have a floor, Mr. Crawford (read your own book). The spell's range entry says the effect is hemispherical. #DnD"
And yes, I do understand the intent of Leomund. We're on a first name basis. After running every edition for a gajillion hours total I ought to be.
Imagine you're walking through a forest. You look over and there's a tent. One of those big family size 10 foot tall, 20 foot diameter tents in a small clearing. Do you think you would notice it, even if it was green?
That's a hut colored green. Why would you not see it? Even if it was covered in brush? If you have someone in the party that can apply camoflauge and if your party takes the time to apply it then you need to determine a DC based on the skill used to do the camoflauge. But it's still a pretty dang huge structure.
Admittedly it's going to depend on distance and all sorts of other environmental factors. I would rule that all you can change the color of the hut to a single monochromatic color. It doesn't say it has chameleon-like powers, or that it can have camaflouge-like markings. You can't make it invisible.
IMHO you are making a useful spell highly overpowered. That's your prerogative, but to paraphrase The Princess Bride, "I do not think it means what you think it means".
And this is all fair enough. It says "color" not "colors" (same as always). Its never been able to be camouflaged in a "multiple hues of the background blending in like a chameleon sense." Its simple though. In arctic tundra? White. In a desert? Color of the sand (khaki or whatever). Dense jungle? Color of the canopy (dark green). Dark stone? Slate grey (or whatever).
Again, you can adjudicate that how you'd like (the system doesn't help you). I'd say an Arcana check (perhaps with Advantage with a Survival assist or Disadvantage if the backdrop is particularly not conducive) contested by Perception (with Advantage on the check if the observer comes in close proximity or Disadvantage if there is particularly hostile cover/concealment for an observer...eg a white-out on the tundra).
That's fine.