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by Greg Egan
Sohkamyung recommends Dichronauts by Greg Egan
Another interesting Hard SF read by Egan. It's not as mind-bending or physics-bending as his "Orthogonal" series but contains intriguing ideas and characters. In contrast to his previous books where the characters slowly learn (and educate the reader about) the physics of their environment, here they are already well versed in the strange (to us) geometry of their universe and its consequences.