If there is a rule about this, I am unaware of it. I've also checked several style manuals and none mention which should come first. That said, I would say "a tall, muscular man" simply because it fits my style.
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JohnParisThat said, I would say "a tall, muscular man" simply because it fits my style.I agree.
Henry74if both A tall muscular man and A muscular tall man are fine.The adjective that expresses the quality more closely associated with the noun comes closest to the noun.
Henry74trying to find a reason for muscular being perceived as more essential than tall.It's for the same reason that shape is more essential than size, whatever that is.
CalifJimHeight may be thought of as a subclass of size. Build may be thought of as a subclass of shape.Oh, I missed that connection. In my head I could only see triangles and shapes of chairs, but no, that makes perfect sense. I think you're right!