I am looking for examples of ideas, historical or current, where the output of a production process is also used as the input. An example could be something like this:
- Magnifying glass is used to heat up sand
- The hot sand is turned into magnifying glass
- The newly produced maginfying glass is used to heat up even more sand
This is an example of a self-magnifying (or positive feedback) process. What are other examples of such ideas?
The reason why I am so interested is that really radical ideas could be produced with such self-magnifying effects.