OffTV.js

// From Openprocessing.org: https://www.openprocessing.org/sketch/106966

let colors = [];
let copy = [];
let stripeWidth;

function setup() {
  createCanvas(700, 700);
  noStroke();
  frameRate(2);

 stripeWidth = width / 7; 
 colors[0] = (color(255, 255, 255)); // White
 colors[1] = (color(255, 255, 0));   // Yellow
 colors[2] = (color(0, 255, 255));   // Cyan
 colors[3] = (color(0, 255, 0));     // Green
 colors[4] = (color(255, 0, 255));   // Magenta
 colors[5] = (color(255, 0, 0));     // Red
 colors[6] = (color(0, 0, 255));     // Blue
}

function draw()  {
  background(0);
 
  for (let i = 0, j = colors.length; i < j; i++) {
    fill(colors[i]);
    rect(i * stripeWidth, 0, stripeWidth, height);
  } 
 
  for (let i = 0, j = colors.length; i < j; i++) copy[i]   = colors[(i + 1) % j];
  for (let i = 0, j = colors.length; i < j; i++) colors[i] = copy[i];
}