Abstract: This modular light-diffusing or reflecting plastic panel, notably for photography, motion-picture and television, comprises a cut panel (1), of semi-rigid material having formed therein by pressing a series of grooves (2, 3, 4), oriented to permit the folding of the panel (1) in different planes in order to impart a three-dimensional configuration thereto with multiple faces; folding tabs and tongues (8, 9, 12) are formed along the panel periphery for assembling it with other similar panels or closing the panel. Various three-dimensional configurations may be given to this panel while preserving its stability in the upright position on a horizontal planar surface. This panel is very light in weight and capable of diffusing or reflecting light in all possible angular directions.

Abstract: Device for the calculation of the geometrical characteristics of rectangles for the framing of various objects, usable especially in photography, architecture, industrial design.This device comprises a plate in which there is formed a preferably square aperture and which carries a graduation indicating a series of ratios between the contiguous sides of rectangles, a ruler mounted for pivoting on the plate and graduated in length, and an element mounted for pivoting on a slider displaceable on the ruler, the element having two perpendicular arms graduated in length, the element being capable of being locked in any desired angular position as a function of the rectangle to be defined.The invention permits of framing rectangles within predetermined limits, easily and with precision, indicating instantaneously to the user the geometrical characteristics of these rectangles.