I have nothing to offer you' said Hactar faintly, 'but tricks of the light. It is possible to be comfortable with tricks of the light, though, if that is all you have.'
His voice evanesced, and in the dark a long, velvet paisley-covered sofa coalesced into hazy shape.
... At least, if it wasn't real, it did support them, and as that is what sofas are supposed to do, this, by any test that mattered, was a real sofa.

Auteur: Douglas Adams