I am the salt of Lake Texcoco: when the ground dries out, I appear like a white layer of snow, becoming very present at ground level. When I blend with the water of the artificial lakes that now populate this great terrain, I become invisible, unnoticeable. I am a combination of sodium and chloride, yet I am never pure: I always mingle with the ground and its minerals, with the residues that come flying from the city, with the air as I am volatile. At times I am called tequesquite, when I form gray crusts on the earth that become cracked and lift up like flakes. I was named that way by the Náhua tribe as they set foot on this ground, as I give the earth the aspect of a gushing stone, of a dust that emerges from below, magically, in the shape of crystals. [...]