Proof of Concept

Engineers have a term, 'Proof of Concept', referring to a functional model of a system; this model, however, is not-by-definition-a-reality-or-a-real-configuration, but it is a perceived solution to--if you were--a perceived problem in reality. Above, a photo of a proof of concept item I'm working on, an oral-nasal mask I have to install into the pressure-suit helmet, for a number of reasons. It works, though it's not nearly close to the actual configuration of devices as they will exist in the entire life-support system. But the assembly works--it is 'Proof of Concept'.