It was a wonderful "specular mount."
"The Adventure of Living"
John St. Loe Strachey
Whiteness then consider'd as a Quality in the Object, seems chiefly to depend upon this, That the Superficies of the Body that is call'd White, is Asperated by almost innumerable Small Surfaces, which being of an almost specular Nature, are also so Plac'd, that some Looking this way, and some that way, they yet Reflect the Rays of Light that fall on them, not towards one another, but outwards towards the Spectators Eye.
"Experiments and Considerations Touching Colours (1664)"
Robert Boyle
But that as White Bodies reflect the most Light of any, so there Superficial Particles are, in the Sense newly Deliver'd, of a specular Nature, I shall now further endeavour to shew both by the making of specular bodies White, and the making of a White body specular.
"Experiments and Considerations Touching Colours (1664)"
Robert Boyle