Yes and no, jgnat. That, of course, would be lovely, but in another sense, I am fundamentally trying to raise a question about how it can be absolutely asserted as true that something exists, can exert power, influence thinking, physically interact with the world, experience emotions and be killed and yet cannot be be described in any fundamentally meaningful way.
It's not the same as dark matter or energy as villagegirl attempted to suggest. Those are hypotheses about what could exist given the discrepancy between observations and functional mathematical models, similar to the discrepancy between quantum and relatavistic physics. Dark matter and energy is a name given to something that could be loosely described as "something that we don't know what it is that appears to be having a large scale and measurable effect on the structure of the universe". The implicit response and understanding of that is we DON'T know what it is and it is being researched very diligently.