A transition in which one element fades out while its replacement fades in, overlapping in time so the change reads as a swap rather than a removal and an arrival.
Crossfade between the two album covers instead of cutting. The swap should feel continuous.
The crossfade is the default transition for unrelated content, and a cop-out for related content. If the next state is spatially or structurally connected to the last one, a morph or a directional move explains the change; a crossfade just admits you didn’t model it.