Poli-Blocks?

Ruminating about political caricature recently, I was reminded of how most humorous depictions of notables begin by equating their heads with geometrical shapes... e.g. among the current ruling group in Canberra, in my view, PM Abbott's head is basically elliptical, Morrison and Cormann are square/rectangular, while Pyne and Bishop (the younger) are basically triangular.

Recently, the great Alan Moir has taken the basic formula to a new level by always substituting a lightly embellished bland yellow circle for treasurer Joe Hockey's nut. Joe's head IS more or less roundish... but, AM's yellow circle is probably related to more of JH's perceived characteristics than just basic shape(?) Whatever, since political cartoonists are generally not fond of wasting time, effort or space on the caricature aspect of their critical comment... maybe we all should look at substituting minimally ornamented geometric shapes to depict political and celebrity entities?

Starting with the premise that they are mostly block-heads, but with no particular personnel in mind...