Just today when I got home, he walked up to the open closet where I was putting my shoes and jacket away, and looked inside curiously. I quietly put my hand in front of him, not too close, but positioned so that he wouldn't be able to walk into the closet without pushing against it. In the past when I did that, he would back away. (Less quickly over time, but away.)
Today he looked at my hand, looked in the closet some more, then stepped *forward* and sniffed my hand.