In what ways does Pozzo and Lucky's relationship contribute to the thematic structure of the play Waiting for Godot?

This pair of characters serve as an excellent reflection of the main pair, Gogo and Didi, in four important respects.  First, the pairing itself speaks to Beckett's idea that our existence answers to two forces -- the mental and the physical.  Numerous critical observations note the hat-shoe and head-foot dualities through the main "plot" (an odd word when discussing a "play in which nothing happens -- twice."  The same relation is reflected in Pozzo and...

This pair of characters serve as an excellent reflection of the main pair, Gogo and Didi, in four important respects.  First, the pairing itself speaks to Beckett's idea that our existence answers to two forces -- the mental and the physical.  Numerous critical observations note the hat-shoe and head-foot dualities through the main "plot" (an odd word when discussing a "play in which nothing happens -- twice."  The same relation is reflected in Pozzo and Lucky's arrangement:  Lucky deals with all the physical needs -- food, stool, etc. while Pozzo makes all the decisions about what to do next.  (That's why his order to Lucky to "Think, Pig!" is so humorous and chaotic in its result--a parody of the inability to communicate in general).  Secondly, the master-slave relationship reverses in the second act, just as Gogo's and Didi's reverses in the second act.  Thirdly, the concentration on food and its scarcity and nonvariety is reflected.  Finally, the plights of both pairs to find "meaning" in their existence is  thematically echoic.  Incidentally, this play was one of the first to use a two-act structure instead of the three-act structure.