Pepper's Ghost is an illusionary technique, which directly connects to how light and reflection behave. By utilizing special lighting teqniques and plate glass, it makes viewers see objects that are not physically there. In that sense, this method has been frequently used for theater, haunted house, magic tricks and special effects in movies.
The first known description of the effect is found in a 16th century Naepolitan scientist and scholar, Giambattista della Porta's work
Magia Nuturalis (Natural Magic) from 1584.