A Portal Symbol with Snake and Goat Nose Flow Markers

I just wanted to show image A, it has a portal symbol that I colorized green, with a snake showing upward flow and a goat nose showing downward flow. Then I added blue color for the "ladder" of short horizontal lines that usually means upward flow, and they are 'little' lines meaning etheric/higher-density flow.

But then I took this opportunity to mention an idea that has been bothering me. I've grown uncomfortable about saying that these vertical snakes are only upward flow, knowing from examples like image C that the straight lines are upward flow and curvy lines are downward, ie, bidirectional. The center flow path like image A's snake and nose is supposed to be bidirectional. So I colorized purple the curvy edge of A's snake, and put yellow on the S shape on image B, thinking those S's were there to mark a downward component. Which brings image D into discussion. The snakehead is definitely doing a "loop-back", going up then coming back down. I'm shifting my thinking about its curvy serpentine body path going up. Maybe everyone except modern people were taught that they chose the snake as a symbol because it naturally had this curvy shape and therefore carried a bi-directional meaning.

By the way, on a tree trunk where branches begin, is considered the next higher reality. Image D is pretty subtle about that.