Vesicles
Ongoing - Concrete, magenets, bismuth, polyacrymalide, silicone, latex, fossils

Let us imagine the living organism in the simplest possible form as an undifferentiated vesicle of sensitive substance: then its surface, exposed as it is to the outer world, is by its very position differentiated and serves as an organ for receiving stimuli.
- Sigmund Freud, Beyond the Pleasure Principle, 1920.

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