an you tell me which direction (clockwise or counterclockwise) Tai Chi (more commonly known as yin-yang in the west) rotates?
Actually, Tai Chi has three dimensions. It's a sphere, not a circle.
If it rotates clockwise on one side, it will rotate counterclockwise on the other.
It's like a pair of fish connected head to tail and tail to head. In space, we have no sense of up and down. Thus, it does not matter whether the rotation is clockwise or counterclockwise, and whether the orientation is vertical or horizontal.
Don't take the invention of the upside down ba gua as a great discovery. On the other hand, there is no need to make much fuss about nothing.