The red material represents resources in our simplified environment.  Resources occupy more space and last for longer durations of time in the upper right hand portion of our environment (example: forest) and occupy less space and last for shorter durations of time in the lower left hand of our environment (example: blade of grass).  Our resources are continuously distributed on the landscape though, there are no gaps between resources.  This is how some people see resource distribution across an environment, but resources are probably not distributed this way.  Instead resources are probably distributed more like the next page.