All forces are understood quite well on the elemental level with the exception of gravity. Gravity, in defiance of common sense, is actually the weakest force in the universe, making it incredibly hard to fully understand on the smallest of scales. All other forces are described abstractly as being both particles and energy waves by quantum mechanics. The force of gravity must also be made of particles and waves by logic. I envision gravity as being full of texture and tensile like some fabric. This photograph was made by shining light through a blanket and printing it in negative values.