What would you compare the cell membrane to that we use today?

The cell membrane can be compared to a security fence around a property. Just as a fence controls who can enter or leave the area while protecting the contents inside, the cell membrane regulates the movement of substances in and out of the cell, maintaining its integrity and homeostasis. Additionally, like a fence may have gates for controlled access, the cell membrane contains proteins that act as channels and receptors to facilitate specific transport and communication.