Light Absorbing/Repelling Torch

I see that another post was subnet on "Light reducing" torches but that wasn't exactly what I had in mind. I was thinking it would be nice to put said torch down in broad daylight and hostile mobs will spawn around it without having to build a clunky, often ugly enclosure. The torch would create a black void around it. What purpose does it serve? To control darkness during the day - general mob farming. Why? Because mob farms are often large Cobblestone eyesores and there's really no getting around it. Also there are situations where you want an opening but to much daylight is getting in. A Light Absorbing torch would be great for playing with lighting effects in creative too.