t=0

draw=_=>{createCanvas(w=500,w)

n=sin

t+=.03

for(c=0;c<w;c+=31)for(r=0;r<w;r+=31)if((r+c)%2<1){beginShape(fill(0))

for(i=0;i<4;i++)for(b=i*PI/2+max(min(n(t+dist(w,w,c,r))*1.5+n(t/2)/2,1),-1)*PI,a=b+3.9;a>b+2.3;a-=.1)vertex(c+cos(b)*32+cos(a)*18,r+n(b)*32+n(a)*18)

endShape()}}