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Digital projection is using digital means to project an image, as opposed to analog film. Different technologies are available for consumer digital projection (LCD, DLP) each with their own separate advantages and disadvantages. Many movie theaters now are equipped with a 4K digital cinema projector, which in many cases is far superior, but similar to a consumer level projector.
Some still do but digital projection systems are gaining ground.
Cardboard, cellotape, and a computer, and also the key component is a toilet seat, put it over the cardboard for full effect of the projection.
Sciagraphy is a branch of science of the perspective dealing with the projection of shadows, or delineation of an object in perspective with its gradations of light and shade. One of the major professional fields that use this technique is the architectural field. In architecture it is defined as a study of shades and shadows cast by simple architectural forms on plane surfaces.