String filenames[] = {"nuclear1.png", "nuclear2.png", "nuclear3.png", "nuclear4.png", 
  "nuclear5.png", "plexiform1.png"}; // Nice:  All pictures in a directory
PImage images[] = new PImage[filenames.length];

void setup() {
  for (int i = 0; i < filenames.length; i++)
    images[i] = loadImage(filenames[i]);
  size(800, 800);
  nextchange = second() + 2;
}

void changepicture() {
  picnum++;
  if (picnum >= filenames.length)
    picnum = 0;
}

int picnum = 0;
void draw() {
  image(images[picnum], 0, 0);
  if (second() == nextchange) {
    changepicture();
    nextchange += 2;
    if (nextchange >= 60)
      nextchange -= 60;
  }
}
void mouseClicked() {
  changepicture();
}

void keyPressed(){
    println(key);
    println(key + 0);
    println(int(key));
    if(key == '0')
      nextchange = 61;
    else
      nextchange = second() + 1;
    
}