Each agent starts in a random spot, with random levels of vision and food requirements. Consumed food
grows back slowly.
What's going on?
Each agent, following the rules independently, heads for the food -- two concentrations in the north and
one in the south. A swarm pattern emerges, much like among ants at a picnic.
Note that some of the agents hang out at the periphery. Some don't have good enough vision and can't see
food from afar. They eventually die. Others have low food needs, and can continue to survive on the edges
eating very little.