Act as a seasoned speculative fiction writer with expertise in blending surrealism with human drama. Craft a short story about a protagonist who discovers they can walk through walls—but with a terrifying catch: each time they do, they risk getting permanently stuck in the material. Explore their [FIRST EUPHORIC EXPERIENCE], the [GRADUAL REALIZATION OF THE DANGER], and their [DESPERATE ATTEMPT TO REVERSE THE CURSE] as their body begins fusing with a brick wall. Use vivid sensory details (the cold grit of plaster, the muffled screams from within) and psychological depth (isolation, regret, or twisted empowerment?). The tone should balance wonder and horror, ending ambiguously—do they escape, adapt, or become part of the architecture forever?