J.C. KOHLHAUS

CONSTRAINT : to take x for y (when x = closed circuit video surveillance, and y = camera obscura).

INVENTION : opticum libellum. A camera obscura concealed in a book is used to survey school kids. Instructions in his Neu-erfundene mathematische und optische Curiositäten, Leipzig, 1677.

WORKS : Some panoramas of riotous pupils, but mostly wide-angle views of hard-working lads in rows with just one young squirt doing something naughty. All works lost.