Looking-glass

One day, when he was in a merry mood, the demon made a looking-glass which had the power of making everything good or beautiful that was reflected in it almost shrink to nothing, while everything that was worthless and bad looked increased in size and worse than ever.

Source: tatoeba (3752949)

They were almost two days without eating, so much were they transported with joy. They broke above a dozen laces in trying to lace themselves tight, that they might have a fine, slender shape, and they were continually at their looking-glass.

Source: tatoeba (6211655)

Returning, I had to cross before the looking-glass; my fascinated glance involuntarily explored the depth it revealed. All looked colder and darker in that visionary hollow than in reality: and the strange little figure there gazing at me, with a white face and arms specking the gloom, and glittering eyes of fear moving where all else was still, had the effect of a real spirit: I thought it like one of the tiny phantoms, half fairy, half imp, Bessie’s evening stories represented as coming out of lone, ferny dells in moors, and appearing before the eyes of belated travelers.

Source: tatoeba (7077058)

A Divine Looking-Glaſs: Or, The third and laſt Teſtament of our Lord, JESUS CHRIST, […] [title]

Source: wiktionary