Artist David Hockney discusses his theory that artists were secretly using optical devices such as mirrors and lenses in creating their work as early as the 15th century.
| Actor | Role |
|---|---|
 David HockneyHimself | Himself |
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Artist David Hockney discusses his theory that artists were secretly using optical devices such as mirrors and lenses in creating their work as early as the 15th century.
| Actor | Role |
|---|---|
| David HockneyHimself | Himself |