convolution:
1. a form or shape that is folded in curved orĀ tortuousĀ windings.
2. one of the irregular ridges on the surface of the brain and especially of the cerebrum of higher mammals.
3. a complication or intricacy of form, design, or structure.
in the context of the second meaning, this could also be called gyrus: one of the manyĀ roundedĀ raisedĀ partsĀ on theĀ surfaceĀ of theĀ brain.
Learned from: Blindness, by JosƩ Saramago.
