A man and a woman stand in front of a Christmas tree contemplating a single thought.
Two people wonder how a Christmas tree got inside their house in the middle of July.
cpntemplating doesn't imply wonder
They may be thinking of anything else rather than wondering how the tree got inside house in the middle of July
man and a woman standing  in front of a Christmas tree contemplating a single thought need not  necessarily mean that two people wonder how a Christmas tree got inside their house in the middle of July.