Lava World (1 Tweet Terrain)

https://www.dwitter.net/d/14821

Javascript Code...

r=X=>S((X|0)**(Y|0));l=_=>r(X)*(1-X%1)+X%1*r(X+1);x.drawImage(c,0,-2);for(i=2e3;i--;x.fillRect(i,1078,1,q))X=i/299+9,Y=t,q=399*((1-Y%1)*l()+Y%1*l(Y++)),x.fillStyle=`hsl(${q/9} ${99}%${30+q/9}%`;