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Keywords from Image Description:
brewster kaleidoscope patent fig . en The basic configuration of reflecting surfaces in the kaleidoscope as illustrated in the patent Fig and Fig show alternative shapes of the reflectors google nl id pgcAAAAMAAJ pg PA lpg PA dq brewsterkaleidoscopepatent source bl ots GXgSUKiGDy sig QEPGMbyWPNyDJdEEkIQ hl en sa ved ahUKEwiovKoHQAhWIMBoKHazAjChDoAQgMAg