This class comprises physical objects purposely created by human activity.
No assumptions are made as to the extent of modification required to justify regarding an object as man-made. For example, an inscribed piece of rock or a preserved butterfly are both regarded as instances of E22 Man-Made Object.
- Mallard (the World's fastest steam engine)
- the Portland Vase
- the Coliseum
In First Order Logic:
E22(x) ⊃ E19(x)
E22(x) ⊃ E24(x)