answer the challenge about the identity
of the interpreter, "Who's there?", and the role of the interpretant,
"Stand and unfold yourself", has been the ready and the abiding state
of a certain system of interpretation, developing its character and
gradually evolving its meaning through a series of imputations and
extensions.  Namely, the MOI (the SOI experienced as object) can
answer for the interpreter, to whatever extent that the called for
conduct can be formalized, and the IM (the SOI experienced in act