in the past
We have written much more extensively about composition in the past, but the key in this context is that elements of your photo will change in black and white versus color. If you are taking portrait photos in color, for example, your subject may have vivid eyes that affect your composition significantly. The same is true in landscape photography, in which case a golden sky can draw the entire image upward. In both cases, you would need to compose your photo differently if you shot in black and white instead – and these are far from the only examples.