It happened totally out of the blue.
Last night, Justin & I went into the kitchen for all of a minute (as long as it took for him to get a glass of water & for me to pour two sippy cups full of milk). I then heard Justin say, "Jen!! Come quick; you've got to see this!"
Luke had pulled a little stepping stool over to the big chair, climbed on up then climbed onto a table. Justin found him playing with the picture on the wall.
I'm guessing that this is only the beginning?