Mather Seerlo can unzip themself by pulling a zipper down from the top of their hairdo revealing MT Shadow underneath. MT Shadow is pantomime as a shadow.
They exist primarily as a full-body black jumpsuit, preparatory drawings, and purchases from magic shops, although MT Shadow can be found anywhere there is a silhouette or a cartoonish black hole on the ground.
MT Shadow did make at least one appearance to date. At a Redmoon Theater party many years ago, upon seeing MT, a couple people exclaimed, "creepy" Perhaps it was the wrong setting. I have since imagined bringing this act to Millennium Park in Chicago, in broad daylight, so it can be better appreciated.