The stars madden, and satellites hum silently
Where no sound can awaken a sleeper. She dreams
A language which cannot trouble her, a vocabulary

Without voice. She has forgotten the ugly grammar,
The deformed sentences. She has forgotten
The irregularities of memory, the unknown knowns,

The can-no-longer-remembers, the slow impeachment
Of experience. She rises, stunned and serene,
Toward the promise of nothing.

— From Sad-faced Men, by William Logan

• Known Knowns: what we know we know
• Known Unknowns: what we know we don’t know
• Unknown Unknowns: what we don’t know we don’t know
• Unknown Knowns: what we don’t know that we know

Further Reading:

https://en.wikipedia.org/wiki/There_are_known_knowns

https://academic.oup.com/jxb/article/60/3/712/453685

https://english.stackexchange.com/questions/35284/known-unknown-vs-unknown-known

The Known Unknowns Matrix

https://ianmchugh.wordpress.com/2014/04/15/the-rumsfeldian-knowledge-matrix/

https://www.google.com/search?sa=X&q=known+unknown+matrix&tbm=isch

Also see:

The Johari Window

The Quadralectics of Marten Kuilman

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