// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 15-5: Setting pixels
  
  size(200,200);
  
  // Before we deal with pixels
  loadPixels();
  
  // Loop through every pixel
  for (int i = 0; i < pixels.length; i++ ) { // We can get the length of the pixels array just like with any array.
    
    // Pick a random number, 0 to 255
    float rand = random(255);
    
    // Create a grayscale color based on random number
    color c = color(rand);
    
    // Set pixel at that location to random color
    pixels[i] = c; // We can access individual elements of the pixels array via an index, just like with any other array.
  }
  
  // When we are finished dealing with pixels
  updatePixels();