Double lobster

[Linda]

I see two problems with this theory. 

First, tubs only occur on the diagrams of Aries 1, Aries 2,  and Taurus 1, on the inner band of Taurus 2, and on the outer band of Pisces.  

Horizontal "barrels" occur only on the the inner band of Pisces.  

What about Gemini and Sagittarius?

There is also an upright tub in Virgo although it is different.

If the tubs were not just decoration, why don't they occur also on the later diagrams?

Possibly they are related to the timing implied by the zodiac iconography?