There are more questions than answers

What is the collective noun for a load of questions?
Is it a barrage?
Is it a Questionnaire?
Could it possibly be a Multitude?
Or, as in this case, a Collage?
Four different photographs of two different question marks, which were on a vacant store window and door. They were actually facing the wrong way on the door and window also, so I turned them round, digitally of course, I am not superman, I am unable to turn a whole building around, and then I adjusted the colour. I then made a blank template and copied each ? on to it.
Just because I can.