"Why is the surrogate or supplement dangerous? It is not, so to speak, dangerous in itself, in that aspect of it that can present itself as a thing, as being-present. In that case it would be reassuring. But here, the supplement is not, is not a being (on). It is nevertheless not a simple non-being ... either. Its slidings slip it out of the simple alternative presence/absence. That is the danger. And that is what enables the type always to pass for the original"

( Derrida 109).