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It's always wonderful to see how figures of the past visualise the future. This diagram is a mechanical construction by the Venetian engineer Giovanni Fontana, called the Castellum Umbrarum, also known as "Castle of Shadows", created in 1420.
The structure and components is equivalent to the modern-day virtual reality room, with
walls made of folded translucent parchments lighted from behind, creating therefore an environment of moving images. Fontana also designed some kind of magic lantern to project on walls life-size images of devils or beasts.
Why "devils or beasts" one is unsure of , but aiming to understand it from a historical point of view, we can interlink the reason for usage of such, or try, at least.
- Giovanni Fontana portrayed himself as a Magus (a Greek word), a follower of Zoroastrianism, or a study of the stars, and manipulating the fate that the stars foretold. Their fascination was within both astrology and magic, but the non-believers of such following meant that the word "magian" gained a negative connotation and often associated them with tricksters and conjurers.
- I mention that the word 'Magus' derives from Greek due to its meaning: the Greek word mágos, or "magian", or the better known "Magician" was influenced by the Greek word goēs(γόης), which was an older word for a practitioner of magic.
- Italy was heavily influenced by Greece, particularly as Italy was also known as the Magna Graeca, or 'Great Greece', as it was a rather important part of the Hellenistic civilisation. (Greek civilisation beyond Classical Greeks that ruled; even when Romans took over the whole empire, the elite among the Hellenistic civilisation still spoke & read Greek as well as Latin).
- Perhaps a tenuous link would be that Greek Mythologies would have also played a role, those that are aware of such would be aware that it is filled with beasts, mythical creatures, heroes and Gods; Mount Olympus ruled by Zeus, the Seas by Poseidon, and the Underworld by Hades (might I also mention Kronos's rule of The Elysian Fields, the resting place for the blessed dead). There is therefore a plethora of devils and beasts within the mythologies that would have fuelled the imagination of the one Giovanni Fontana to bring stories alive with his Castle.
But I digress, there is a more formal explanation of the Castellum Umbrarum on BLDGBLOG.
More reading:
Giovanni Fontana