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Because a single lens inverts an image projected through it (as in the phenomenon which inverts the image of a camera obscura), slides were inserted upside down in the magic lantern, rendering the projected image correctly oriented. [1] It was mostly developed in the 17th century and commonly used for entertainment purposes.
"Lying on the floor one evening and watching the inverted face of one of the graduate students who was talking while standing up, I was intrigued by the ludicrous expressions of the talking mouth when viewed upside down. In my imagination I pictured eyes and nose on the chin to complete a small face engaged in animated conversation.
Light bulbs are sometimes used when the character thinks of an idea or solution to a problem. Characters speaking in "grawlix" symbols, to indicate profanity. In the Western world, it is common to replace profanity with a string of nonsense symbols (&%$@*$#), sometimes termed grawlixes.
Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display , or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen.
Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector. However, because the lamp was suspended above and outside the reflector, a large amount of light was cast to the sides inside the projector body that was wasted, thus requiring a higher power lamp for sufficient screen illumination.
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The use of the gobo is "subtractive", as opposed to using a "reflector" to bounce added light into a shadow (thus "additive" lighting). Use of a gobo subtracts light from a portion of an overall shaded subject and creates a contrast between one side of the subject and the other. [17]
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