General Optics
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A1-41: DRAWING PUZZLE - INTERSECTING RODS
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A1-42: DRAWING PUZZLE - HALF CUBE
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A1-43: CROSSING RODS
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L1-03: LIGHT BULB WITHOUT VACUUM
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L1-05: PERSISTENCE OF A FILAMENT
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N3-03: COLOR MIXING WITH DICHROIC SPOTLIGHTS
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O2-22: STROBOSCOPE AND FALLING WATER
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O4-06: OPTICS OF A GLASS ROD
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O4-08: GREEN TOMATO
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O4-23: LIGHT PISTON
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O4-31: TRAPEZOIDAL WINDOW
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O4-32: SIZE OF COLORED FIGURES
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O4-33: IMPOSSIBLE TRIANGLE
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O4-34: IMPOSSIBLE CRATE
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O4-35: WALK-IN BOX
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O4-36: PERSPECTIVE BOX - CHAIR
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O4-51: ANAGLYPH
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O4-52: POLARIZATION 3D EFFECT
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O4-53: STEREOGRAMS - 3D IMAGES FROM RANDOM PATTERNS
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O4-54: VIEWMASTER