Marching Squares (ASCII Metaballs)

Generates smooth isolines from a continuous scalar field (metaballs) using the Marching Squares algorithm.
In this ASCII translation, floating glowing spheres of "energy" bounce around the grid. Instead of drawing vector lines, we use block characters (`█, ▄, ▀`) to create a solid, organic blob that dynamically merges and splits based on the underlying field thresholds, rendered in the garden's cyan-green hue.