timelets

Let A be person, B - tool, C - work.



Heidegger's "ready-at-hand" means that the triangle commutes. Similarly, Christensen's "job-to-be-done" requires that an innovator solves for h = g after f, rather than building straight f. A section would do, but an isomorphism like "xeroxing" or "googling" would be much better.

It's quite a neat idea to show how we can discover or generate an emergence effect by joining systems.




from Fong & Spivak, Seven Sketches in Compositionality.

As in

Fisher, like many other experts, attributes the sex decline to a decline in couplehood among young people.
...
About 60 percent of adults under age 35 now live without a spouse or a partner. One in three adults in this age range live with their parents, making that the most common living arrangement for the cohort.

https://www.theatlantic.com/magazine/archive/2018/12/the-sex-recession/573949/

A similar concept is used for describing quantum processes:



from Coecke & Kissinger, Picturing Quantum Processes, 2017

The clouds is a good reminder of how non-trivial the Galileo's hypothesis about falling bodies is.