Little People?

When sitting at my desk, you can see into the kitchen clearly as my desk is up against the bar that separates the kitchen from my office (which is supposed to be a dining room). 

The past few days I have been seeing what appears to be the top of my three year old son's head moving through the kitchen. All I see if the very top as it moves across the kitchen. I always sit up more when I see it to see what my son is doing (he likes to steal cheese from the fridge), but 99% of the time I find the kitchen empty.