What is the purpose of Chuck Close's grid in his work?

The use of the grid methodology in Close's work was quite
deliberate.  In replicating the chosen sample through the grid method, Close was able to
create multiple examples of a "picture within a picture."  Each grid contained its own
definition of color and when fit together, comprised a whole that made it difficult to
distinguish part from whole.  I think that the purpose here was twofold.  The first was
that Close wanted to forge the link between art and representation through pictures.  In
doing so, one is challenged by the notion of pictures versus art and Close's grid method
is able to make this happen.  From a symbolic point of view, there is something quite
profound about smaller pieces, insignificant by themselves, contributing to a larger
fabric or vision which is impossible without their composition.  I think that the Grid
method is one way in which Close was fairly radical for an artist.  The grid method is
something that art classes now use quite often in order to teach students about the
notion of composition and breaking down artistic barriers, even at the youngest of
stages.  This is something that Close was fairly effective at through his use of the
grid method.