Claude Glasses and Mirrors
At leisure, then, I viewed, from day to day,
The spectacles within doors, — birds and beasts
Of every nature, and strange plants convened
From every clime; and, next, those sights that ape
The absolute presence of reality,
Expressing, as in mirror, sea and land,
And what earth is, and what she has to show.
The "mirror" to which Wordsworth refers was the Claude mirror, an optical device used by many artists and devotees of the picturesque during the Romantic period, which includes the decade of the Regency.
Wordsworth did not approve of the use of either the Claude mirror or the Claude glass, both of which rendered views of the natural world in a manner he considered unnatural. But both of these devices had been popular in the later part of the eighteenth century and continued to be so in the first decades of the nineteenth century.
So just what are Claude glasses and mirrors?
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