Overlapping Swarms?

[Particle_Man]

Perhaps you can apply the squeezing rules somehow?

 

[Hypersmurf]

Makes sense thematically, although the MM specifically suggests that one compose a larger swarm of multiple smaller swarms

That's what I was referring to.

--so a 20X20 swarm is actually two 10X10s.

Four 10x10s.

But that's my point - rather than having two 10x10 swarms occupying the same space, you'd have one 10x20 swarm (composed of two 10x10 swarms occupying adjacent spaces). They don't 'stack', they 'spread'.

-Hyp.