Clicking "Explain the ψ mapping" led to Grok attempting to retrieve
a 1992 paper by Baartmans et al. from sciencedirect.com, which has
a captcha to block robot access. This led to . . .
For non-robots, the relevant sciencedirect.com page is . . .
Alphonse Baartmans, Walter Wallis, Joseph Yucas,
A geometric construction of the Steiner system S(4, 7, 23),
Discrete Mathematics, Volume 102, Issue 2, 1992, Pages 177-186,
ISSN 0012-365X,
https://doi.org/10.1016/0012-365X(92)90052-H.
(https://www.sciencedirect.com/science/article/pii/0012365X9290052H)
Abstract: The Steiner system S(4, 7, 23) is constructed from the geometry of PG(3, 2).
Some background from Google's AI Overview —
My own illustration of "a line lying entirely within the quadric" —
