First, can you give a reference in the current ruleset? If not this is a DM call.
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".
Umm ... magic anyone? This is not a physical structure, it's a magical one.
Good to know you can derive intent of not only a fictional character, but the WOTC design team.
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.
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".
I'd say he was making an overpowered spell (3rd level spell, should be 6th) even more overpowered (should be about 8th).
Edit: Even my most powergamery players have never tried arguing that the spell creates a floor. It's
bad enough when people adduce text from level 6 Wall of Force spell and claim it's relevant to a level
3 LTH spell.
But I think the important thing about this spell is not exactly what it does, but that it reduces enjoyment - specifically my enjoyment - at the table. I've not banned it but I definitely wish the designers had either not included it, or done a much better job in designing the 5e version.
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