The discussion centers on a hypothetical vehicle based on the zeroth law of thermodynamics, specifically a perpetual motion machine (PMM) of the zeroth kind. This concept involves three thermal reservoirs where two are at the same temperature while the third is not, allowing for a heat engine to operate between them. When one reservoir is removed, the remaining two eventually equalize in temperature, negating the energy difference needed for operation. An example cited is MC Escher's perpetual waterwheel, illustrating the impossibility of such machines as they violate the zeroth law. Ultimately, these machines cannot function as they contradict fundamental thermodynamic principles.