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Are you thinking of Chasm City, or did I miss that subtext in the later books?

I'm only half way through that now so not that one (unless they get to it). I think it was redemption ark, or on of the main trilogy.

I can't remember any Mandela effect. There's group consciousness (mentioned in RS and CC, but covered massively in Absolution Gap and some short stories), and some contact with a parallel universe (in AG/RA), but no independent mass misremembering.

There's some mandala drawings in Revelation Space (Philip Lascaille draws them on the pavement in chalk), and there are huge structures called Mandalas in the second and third parts of the Poseidon's Children series. Is it possible that this is what you refer to?

It goes into it a bit when they go over the history of that mass reducing machine, how a scientist testing it was wiped from history except for one nearby co-worker.

Or does it have to be more widespread to be the Mandela effect?

Close enough for me. That vaguely rings a bell. I'll have to reread those, and pay better attention.

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