Metaballs (Not to be confused with Meatballs) In computer graphics, metaballs are organic-looking n-dimensional isosurfaces, characterised by their ability to meld together when in close proximity to create single, contiguous objects. Source: Wikipedia
This simulation uses marching squares to draw the blobby shapes. Processing 4 was used to create it.
See references for more info on how the simulation works.
Processing 4 is needed to run the program through source code.
How Computers Draw Weird Shapes (Marching Squares) - Reducible