Colin understands waving by waving his fingers "hi"! He is waving his fingers and the funny thing is, he is waving the way HE sees it. He is waving his fingers at himself! It's hysterical and he keeps doing it over and over and over again! Yay for new skills!!
And by the way....he is waving hi back to me. I'm waving at him while taking the video! So much fun!