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Different observers can disagree about space and time without disagreeing about the laws of physics. In Minkowski spacetime, observers moving relative to one another use different space and time axes, connected by the Lorentz transformation. What remains unchanged is the spacetime interval and the structure of the light cone....

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Philosophy Of Physics

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The strangest feature of Anti-de Sitter spacetime may not be its negative curvature. It is the boundary. Light can travel outward, reach this boundary, and return in finite coordinate time. This makes infinity more than something infinitely far away. It becomes part of the causal structure of the spacetime, a feature that later became central to ideas such as holography and AdS/CFT.
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