Introducing a stockpile into a void creates a closed system. Where there was nothing now stands a set of entities, possibly simple or symbiotic that can survive from that resource and others use of that resource.
Depending on the complexity of the stockpile different simple forms of life can procreate. These allow for a large potential of tertiary organisms to inhabit the void. The void is a closed system through its own interactions but, there aren’t outer walls. The boundary created by the void of needed nutrients is permeable.
A system that takes advantage of a void in this manner requires a sort of input; a stockpile that won’t be depleted. Another manner of creation would be a beginning organism that created a void around itself. By consuming around itself it is no longer static. It goes from a limited and known object into a system that could be healthy. It has the potential to develop, and as long as long as there is little excess or squander we can consider it a healthy system.
As the initial organism develops an increased amount of tertiary systems the permeable membrane becomes important. Systems can come and go which means that energy in the void fluctuates, for either better or worse. That allows for the initial organism to become more complex and make use of other nutrients.