The story of the oyster:
1954, biologist F.A.Brown dug up a batch of oysters from the seaside in Connecticut and put them in an aquarium in a basement in Chicago thousands of miles away. He is a biorhythm researcher, and he knows that oysters will live with the ebb and flow of tides. In the first two weeks of moving into a new house, nothing has changed.
Oysters still live according to their normal rules: sometimes they retract, sometimes they open their shells, catch plankton in the sea and feed themselves, and everything goes up and down with the tides on the distant Connecticut coast. But in the next two weeks, something inexplicable happened.
They still rise and fall like the tide, but their high tide behavior is no longer consistent with the tide in Connecticut. It's not Florida, it's not California, it's not Dover, and it doesn't conform to any scientifically known tide table. After repeated calculations, Brown realized that it was high tide time in Chicago. But there is no sea in Chicago.
These oysters live in artificial seawater in reinforced concrete basements and glass boxes. But they know the existence of the sea, and their ancestors lived by the sea for hundreds of millions of years; They can leave the sea, but the sea won't leave them. Brown speculated that perhaps the oyster sensed the change of air pressure, thus inferring the time when the tide should come and its own rhythm.
No oysters are doing all this consciously-but in a deep sense, they are imagining such a sea, a sea that does not exist in any corner of the earth, where there will be tides, and they will open and close with the rhythm of the sea. There is no sea in Chicago, but oysters bring the sea.