Plaintext question (essentially an excuse for the wordplay).

The “traditional” effect A makes it seem that nearby stars are moving in relation to faraway stars, when seen from the earth. This is essentailly caused by the motion of the earth around the sun.

The “reverse” of the traditional effect is actually an artifact of gravitational lensing. The outcome is the exact converse of A, and hence named B.

**B?
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Cracked by: Raghuvansh, Rogi, jowens, shrik and dineshk