perpetual motion machine (noun)

1. The artist created a beautiful sculpture of a perpetual motion machine using various materials.

2. In the history of engineering, there have been numerous attempts to construct a working perpetual motion machine, although none have been successful.

3. Some religious texts mention the existence of mythical perpetual motion machines that were believed to manifest the eternal power of the divine.

4. The novel depicted a future society where society thrived on the invention of a wondrous perpetual motion machine, transforming the world as we know it.