A profile view of the human body with it’s arms extended overhead.
A line is drawn on the profile of the body that runs from the hands down to the feet, and includes a loop around the buttocks.
The line is redrawn so that it also loops around the chest in the next picture.
Here is a picture of the Yin Yang Symbol.
Then a picture of the Yin Yang Symbol compared to the human body with the line looping around the chest and buttocks.
The Yin Yang Symbol is then split into identical halves along it’s inner boundary.
The white half of the Yin Yang Symbol is then placed parallel to the upper body of the model human being so it’s tail matches the hand and the circular end matches the loop on the chest.
Then the black half of the Yin Yang Symbol is oriented so it’s tail matches the feet and it’s rounded ends match the loop of the line around the buttocks.
Finally, the line on the human body model is changed so there can be very little doubt as to the point of the comparison.