Black cats are a notoriously hard feline to photograph. Without the right lighting and contrast, many of the features of a black cat simply blend together and become indistinguishable in photos.
With all black features from their fur to their lips and ears (even their skin is black), black cats don’t have the patterns and skin tone of other cats that make their features stand out.
This effect becomes even more pronounced when a black cat is in the shadows or up against a dark background. The blending extends out towards the shadows and not even the outline of the cat is visible.
People affectionately call their black cats voids because of this phenomena of two bright eyes peering out from a pool of darkness. All kinds of internet memes have spawned from showing black cats as voids.
Those feline eyeballs staring out at you from your laundry hamper? Void. The black cat sleeping under your bed? Void.
Black cats blend with night,
Voids in shadows they become,
Darkness holds them tight.
That ability to blend in with their surroundings is one reason why black cats love to lie on black things.