The movement of water or any other small molecule through a polymer is kinda like the movement of small meatballs in a big bowl of spaghetti. In this here analogy, the meatballs are water and the spaghetti are the polymers. This analogy maybe only relevant for polymers.
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database