Control Alt Delete the Vortex~
Blake understood that a vortex is capable of drawing into itself whatever comes within the perimeter of its control. It sucks matter into the ever increasing rotational motion under its dominion. As the rotation tightens, the movement becomes downward, into the depths from which escape seems impossible.
Blake found this an appropriate image of the situation endured by Urizen. Having attempted unsuccessfully to acquire the functionality of Urthona, Urizen had lost the integrating and relational skills which would have allowed him to function. Around him had formed a body of assumptions and expectations which served his unrealistic self-image. He was trapped in thought patterns which drew him inward and downward away from any corrective measures which would have allowed him to escape.