Comment #9 on issue 2020 by asmeurer: Symbols & Matrices http://code.google.com/p/sympy/issues/detail?id=2020
What we really need are custom Add, Mul, Pow, etc. classes that know how to handle these things.
Really, the default Mul, Add, etc. should be smart enough to do it so that they are independent of any special types on objects. See issue 1941.
By the way, symbols with shape is also issue 1860. Is there a difference here? I think maybe it's that this issue is about making sympify(Matrix) work, too.
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