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Penrose unilluminable room: Image title: Roger Penrose's solution of the illumination problem using elliptical arcs (blue) and straight line segments (green), with 3 positions of the single light source (red spot), drawn by CMG Lee. The purple crosses are the foci of the larger arcs. Lit and unlit regions are shown in yellow and grey, respectively.
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The following other wikis use this file: Usage on arz.wikipedia.org مفتاح الحياه; الصليب; اللبرومه; قالب:صليب مسيحى
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Christian crosses are used widely in churches, on top of church buildings, on bibles, in heraldry, in personal jewelry, on hilltops, and elsewhere as an attestation or other symbol of Christianity. Crosses are a prominent feature of Christian cemeteries , either carved on gravestones or as sculpted stelae .
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