If you had been a child growing up in the Silesia region, you would have been collecting green, magical rocks with patterns. Fascinated by their look, you would delve into the past stories of their origin, maybe create stories about the underworld, maybe hold on to them forever because you truly believed they brought good luck. Those beautiful rocks are in fact a by-product of smelting iron ore. Although it may sound less exciting than the gift from the underworld, these rocks are symbolic of everything that is hidden, even if its presence is nebulous and unclear. They tell the story of decay and transformation, the story of changing substances exposed to fire, water, and human work. Bartek Arobal Kociemba, a Polish visual artist who works with paper, crayons, flowers, grasses, and branches, explores here the physical structure of the materials used, the mineral particles they contain, the artist’s movements and gestures.