Perspective
Perspective
Perspective
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I think it is the bottom of the top of the stairs because of the lighting to the bottom left of the mattress. That should be in shadow from the mattress if it was at the bottom of the stairs.
Curses!
We are looking down on the mattress and it is casting a shadow on the step below it. If we were looking up at the mattress it would be casting a shadow across the stairs in front of it.
Could be that there's a door or window that's contributing a lot of light down low, spilling under the mattress.
Definitely the bottom of the top. Or is it the top of the bottom?