This is what gets me confused. If we’re at the top, I see the banister mount turning horizontal, not up. Up from that POV would be towards the viewer, but it’s angled away which would be horizontal. We have to be looking from the bottom for it to be turning up in this photo. I have no idea how hundreds of people look at that and say it’s turning up.

E: nevermind, the question asked where the mattress is, not where I am looking from. 🤣