The shadows: some hide, others reveal.

Porchia treats “shadow” as more than mere darkness: it is an effect of light, a sign that something stands between us and full illumination. The aphorism proposes a double function. Some shadows conceal—protecting, obscuring, or distorting what is present. Others reveal—by outlining forms, sharpening contrasts, or indicating the presence of something otherwise unseen. In human terms, what seems like obscurity (silence, ambiguity, secrecy, even suffering) can either mask reality or disclose it indirectly. The sentence’s balance and brevity enact its meaning: it refuses a single moral about darkness, insisting instead on discernment—learning which kinds of obscurity mislead and which help us see.