A set of seven semi-transparent circles, each with a distinct neon color, converges at the center of a fixed, full-viewport SVG. The circles are first sorted by descending radius so larger shapes render behind smaller ones. Using D3 v7's `select` and the `.join` operator, the visualization binds data to circle elements, setting their `cx` and `cy` attributes to the container's midpoint and their `r` and `fill` from a hardcoded data array.