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Mascarpone is a stack-based, self-redefining programming language designed by Chris Pressey in 2007 as a successor to Emmental. In Mascarpone, meta-circular interpreters are first-class values; the interpreter currently being used to interpret the program may be pushed onto the stack ("reified") and manipulated, and an interpreter on the stack may be popped and used as the interpreter for the following part of the program ("deified").
While the author has never really been sure of the extent to which Mascarpone "counts" as an esoteric programming language, from a typical programmer's point of view, it is not obvious how to program in it, and programs in it are borderline-unreadable strings of symbols.