Four creatures, one loop. The expression i%4·5 assigns each of the 10,000 points to one of four phase families. Because m feeds both the pulse (p) and the drift sweep (c), each family pulses and wanders on its own schedule — four jellyfish from a single for-loop.

Bell and tentacles. k (from cos(i·342)) shapes the bell width; e (from sin(i·271)·2) drives the trailing tendrils via e·p — so when the pulse p contracts, the tentacles pull in too. The 89·sin(c) term sweeps each jellyfish across the canvas on its own slow orbit.

Try: set jelly count to 1, then back to 8. Same math, different school.

a=(m,d=mag(k=2*cos(i*342),e=sin(i*271)*2)/1.6)=>point(k*(p=5+2*sin(d*8-t*3+m))+9/d*sin(k*2)+89*sin(c=d*d/9-t/8+m)+200,79*sin(c*2)+9/d*sin(e*2)+e*p+200) — called with a(i%4*5)