| http://www.w3.org/ns/prov#value | - folder, a reflector, such as a mirror, which automatically disposes itself in such position that when the. eyes are brought into a certain relation with the mir ror, one of the pictures is reflected to one eye in such manner as to be visually su erimposed u on the op osite picture, whic produces t e efiect o a single picture of the third dimension.
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