I'd intended the [trichotomy](https://thoughtstreams.io/jtauber/response-to-dave-about-principal-ideals/10796/) to be:

- consequential / timelike

- inconsequential /spacelike

- tangential / lightlike

but it's been decades since I've dealt with the [molluscs](https://thoughtstreams.io/Dave/embalmed-ones/10804/) of space-time.