In my life, imagination is preparation for an event. In trigonometry, sin(x) peaks one quarter circle before cos(x). Tai Chi Chuan is a highly controlled martial art form. When learning the postures, the flowing imagination wave and the flowing body movement peak alternately resembling the trig. waves.
In the image below, the waves are travelling from left to right, so the first images to have happened are on the right of the page.
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