Craig is drawing a staircase from the point of view of looking downward from the top. This creates an image of stairs cascading in a downward spiral. There is a blue light coming from the bottom. What is the feature of this drawing that makes it have rhythm?

The curve of the stair rail,
the high perspective,
the light source,
the stairs.

It is the curve of the stair rail that creates rhythm in this drawing. The continuous flow of the rail as it spirals downward creates a sense of movement and repetition, adding a dynamic element to the overall composition.