[Cob] just cob until it feels right

[karl and tabitha o'melay]

while attending a cob party (me learning to cob) a question arose. if 
the sand is course do you need to add more or less clay proportionally 
than fine sand?

borrowing a frequent analogy
if
the clay is mortar
the sand is brick
the straw is rebar

then, logically
if the brick is really large, less mortar would be used to assemble a 
given wall?

or does that not hold true in this case?

anyway we just mixed until it felt right--which ultimately "is" the 
right answer since these ingredients don't have (laboratory level of 
quality control standards) and adaptability to different site 
ingredients is what is most important.

but, the question still remains--does my adopted analogy hold up?

i'm sure that i'm over-thinking the day but these kind of unanswered 
questions keep me awake.

k-)