Watch the water rush in against the normal direction of the river flow. Then a bit later the direction changes back to normal - after high tide. At high tide both sides are equal for a moment and the water goes round and round without going one way or the other. Then the river flows out again. People have been watching that tide come and go since before they had houses.
Tides are part of nature, like day and night.
These big black birds fly down the river and perch on anything they can find. M Ltd. All rights reserved.