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let n = 0.0;
let m = 0.0;
function setup() {
createCanvas(400, 400);
}
function draw() {
background(220);
for (let i=0; i<=height; i+=10){
fill(map(i, 0, height, 0, 255))
beginShape();
vertex(0, height);
for (let j=0; j<=width; j+=10){
vertex(j, i - noise(m + j / 100, n + i / 100) * 100);
}
vertex(width, height);
endShape(CLOSE);
}
n += 0.005;
}