This is such a fantastic thread. I absolutely live for these deep-dive details. The Stillness is a phenomenal concept—that detail about spoken words feeling like a "violent intrusion" is just perfect. It immediately builds a whole culture in your mind.
My current obsession is a place called The Pallid Deeps.
It's a colossal, multi-leveled city built within a vast underground cavern system, but its defining feature is that the entire environment is naturally, perfectly achromatic. The rock, the water, the fungi, the fauna—everything exists in a spectrum from pure white to pitch black, with an infinite gradient of greys in between. There is no color, naturally.
Color is the region's most precious resource. It's mined. Deep within the earth are "Pigment Veins," crystalline seams of raw, condensed color—a vein of pure vermilion, a geode of shimmering cerulean. Mining rights are controlled by ruthless cartels, and a single, uncut "Colorstone" is worth more than any diamond.
The vibe is austere and starkly utilitarian, but punctuated by shocking displays of wealth. Imagine a world of grey stone and grey-clothed people, and then you see a Guild Baroness walk by with a cloak dyed a searing, impossible crimson. It's not just a status symbol; it's a sensory assault.
My favorite detail is about the people who live there, the "Huesworn." Because their world is so muted, their eyes are incredibly adept at distinguishing between thousands of shades of grey that an outsider would barely notice. This skill is vital for everything from navigating the caverns to assessing the quality of undyed textiles. Conversely, they have a very low tolerance for pure color. Staring at a raw Pigment Vein for too long can induce a state of euphoric, disorienting madness they call "Chroma-fever," and master dyers who work with color all day often have to spend weeks in "Bleaching Sanatoriums" to restore their sensory balance.