function setup() {
  createCanvas(1000, 1000);
  
  noStroke();
  
  let deepstate = "#667686"
  let shallowstate = "#CCD6DD"
  let unknown = "#353535"
  let black = "#000000"
  
  fill(shallowstate);
  circle(500, 500, 1000);
  
  fill(black);
  circle(500, 500, 700);
  
  fill(unknown);
  circle(500, 500, 600);
  
  fill(black);
  circle(500, 500, 300);
  
  fill(deepstate);
  circle(500, 500, 200);
}