Emily Zhou –– String Art

sketch

function setup() {
    createCanvas(400, 300);
}

var ratio = 0.75; // width to height ratio
var radius = 400; // length of radiating center lines

function draw() {
    background(47,19,116);
    // circles:
    // outer circle
    fill(244, 96, 54);
    noStroke();
    ellipse(width / 2, height / 2, 300, 300);
    // middle circle
    fill(245, 110, 72);
    noStroke();
    ellipse(width / 2, height / 2, 150, 150);
    // inner circle
    fill(246, 124, 90);
    noStroke();
    ellipse(width / 2, height / 2, 50, 50);

    // lines:
    // center radial
    for (var a = 0; a < 360; a += 10) {
      stroke(255, 249, 104);
      line(width / 2, height / 2,
        // trig uses var radius as hypotenuse
        width / 2 + radius * cos(radians(a)),
        height / 2 + radius * sin(radians(a)));
    }
    // bottom left corner
    for (var b = 0; b < width; b += 7) {
      stroke(66, 51, 227);  
      line(0, b, b / ratio, height);
    }
    // top left corner
    for (var c = 0; c < width; c += 7) {
      stroke(30, 81, 221);  
      line(0, c, width - c / ratio, 0);
    }
    // top right corner
    for (var d = 0; d < width; d += 7) {
      stroke(66, 51, 227);  
      line(width, d, d / ratio, 0);
    }
    // bottom right corner
    for (var e = 0; e < width; e += 7) {
      stroke(30, 81, 221);  
      line(width, e, width - e / ratio, height);
    }
}

It took me a while to catch on, but I hit one good curve and used it to figure out the others. I played around with difference colour schemes and decided to go with a sun, stars, and space theme from there.