What shape is my ego?

The ego is invisible.

In some films, there is an invisible entity. The invisible entity is shown by throwing dust over the whole scene, and the shape of the invisible entity shows up, in outline. If you like Star Trek, you'll discover that the tachyon detection grid works in a similar way to reveal cloaked Romulan warships (http://www.starshipexcelsior.com/union_rpg/unitsdefenses/system.html).

When I examine why I'm upset, I invariably find that I'm upset because I have a demand or an expectation. The sum total of the demands and the expectations is the plan for the universe devised by my ego. It is only by examining upset that the ego's global plan can be gradually revealed, and then dropped or redirected.