I twisted a fan brush loaded with paint to begin this composition. I interposed some red between the feathered spikes of blue. This design contains several depictions of funnel, or funnel effects. Infundibulum is from the Latin. It means funnel. It is also the term for stalk that connects the hypothalamus to the pituitary, dangling just below the brain proper. (I did not have this in mind as I sketched the study below, although the orange/brown boomerang-shaped appendage jutting down from the top of the paper could represent the anatomic infundibulum.)
There is a funnel formed by the curl of the blue spiky lines. This structure reminds me of a breaking ocean wave. Surfers often ride the inner funnel of these waves. To the left of the this is another blue structure that looks like the side view of a cyclone. The faded yellow triangular area could be the rim of a funnel that drains to the white center of the composition.