Before I leave for work in the morning, I put a gate up across the top of the stairs. The idea behind this is that with a gate blocking his path, Wylie will stay upstairs instead of trying to get Terry into trouble.
Yesterday I came home and found Wylie sitting in the living room. Today I came home and found him in the basement. (I fear that the next stage will have him burrowing his way out, under the foundation.) In both cases, the gate was undisturbed.
My conclusion is that Wylie read Wednesday’s post and wants to demonstrate that he darn well can teleport!