title: Can a patch in net logo have two color and one is hidden sometimes?
body: <p>I am doing a tree grow in net logo, I have to implement a hidden trunk. But how can I make a patch assign to trunk color when there is no leaf and sometimes hidden behind leaves and showing leaf color ?</p>
  
  <p>When we standing in front a tree, we sometimes cannot see the upper trunk cause the leaves. That is what I am going to model for now.</p>