One of the most useless and unnecessary types of light are those that are used to light up blank walls. Okay so the J Willard Marriott Library is a big building but The Dark Ranger doesn't think University of Utah needs to worry about it getting hit by low flying aircraft. All a building needs is light over it's doors. Light draws primates just like it attracts moths and you want them to come to the doors not flutter up against the wall -- mostly talking about moths here... but not entirely. Primates congregating against a bright wall can lead to trouble too -- trouble like graffiti.
Why would you light up a wall? Seriously people! If you can think of one good reason to light a blank wall The Dark Ranger would love to hear it. Please post your justification it in the comments below.