What are special effects? How did Alfred Hitchcock create some of the first examples of special effects without modern technology?

Special effects are the artificial visual effects or illusions that are incorporated in the films and television by using computer graphics and camera tricks to stimulate virtual scenes.

Aldrich Hitchcock was a famous English film director and producer who is said to be one of the most influential filmmakers of his times.

He created some of the first examples of visual effects where some of the effects were optical and others were mechanical.

Special effects are scenes and elements traditionally made by computer graphics which gives support to filmmakers to tell a story as their imagination desire. In the case of Alfred Hitchcock, special effects are more simple, but even so, impressive. Light manipulation, camera shot, mechanical scenario ... Hitchcock manipulated the scene as he wishes.

Explanation:

Goods examples of special effects in Hitchcock's films are the use of the yellow screen in "The Byrds", and the subtle atmospheric manipulation in the neighborhood in "Rear Window".