Does a picture necessarily fit in one category?

Question: 

Is it possible that a picture we take doesn't fully fit in one of the category? Or could it be that it fits in several categories? Sometimes I take a picture and I am not able to say what attracted my eye the most, sometimes it is just a little bit everything, a general scene...

Answer: 

Of course that's the case. The point of the catagories is that we are proposing a set of training assignments, and when people do the assignments, they submit images correspond to the assignment catagory.