see: https://www.frontiersin.org/articles/10.3389/fncom.2017.00048/full
also: https://bigbang-entanglement.blogspot.com/2019/09/john-c-cramers-ti-or-multi-mirror-world.html
and: https://bigbang-entanglement.blogspot.com/2019/08/the-conscious-multiverse-with.html
or: https://bigbang-entanglement.blogspot.com/2019/07/john-cramers-ti-and-super-symmetric.html
and: https://bigbang-entanglement.blogspot.com/2006/03/max-tegmark-john-cramer-and-aphorisms.html
and: http://www.idemployee.id.tue.nl/g.w.m.rauterberg/lecturenotes/DGB01%20ADD/libet-1999a.pdf