Not common knowledge. Too weird to bother describing. The stuff of the abstract realms has so little in common with conventional reality as to render it essentially beyond rules considerations.

The Noösphere is the realm of pure ideas, from which abstracta reach out to touch the cosmos. Every act, deed, thought, and phenomenon touches the Noösphere, and abstracta manifest through that connection. Their impact is essentially invisible, intangible, and unintelligible (and thus negligible).

See notes on abstracta, ephemera, and concreta. Only ephemera would have any direct traffic with abstracta, and even an ephemeron would tend to traffic primarily with concreta or abstracta, not both.