How full is your glass?

This morning I awoke to the sound of a bulldozer working directly across the street from my house. I said to my 2 year old grand daughter "You hear that noise? That's a bulldozer.", and I showed her through the window. Now, up until that moment I was feeling rather annoyed, that the lovely earth was being dug up in such a noisy fashion. My grand daughter looked at that bulldozer and exclaimed "Yea!", while clapping her hands. So, while we were sharing the same glass (experience), apparently, my half was the empty half, while hers was the full half.