Consider lighting in combination with height:

I saw what should have been a lovely exhibition of someone's print collection (including wonderful ones by Bert Hardy and Karsh of Ottawa) ... but the guy who hung the exhibition was 6'6", and while I could have seen the prints OK even from my meagre 5'8", the reflections off the glass meant I couldn't see a thing.

I spoke to him and he hadn't considered either his height or the lighting ...