Thank you terri and sashbar for your comments.
Terri, I've never thought the empty space could make a subject vulnareble by it's size...in a way you are right I think, I understand what you mean.
I took the picture of my friend's kitten, because she looked so vulnerable for the outside elements (she was sleeping on the chair in the garden), how she was just fallen asleep like that, was amazing to watch, but in the same time it gave me a caring feeling in my heart...I wanted to save her from all the bad things that could happen to her in life...even I am not a person who would like to have a pet, but that little kitten warmed my heart....