Tidepools are sanctuaries. Brimming with sea life of a lesser order, they are home to anemones, barnacles, starfish and snails. In these havens, benign creatures can dwell in a peace unmatched in the ocean at large. At low tide, the surrounding stones hold back the sea leaving the pool and its inhabitants undisturbed. On this tranquil evening, the still, shallow, waters reflect the amethyst hues of the twilight sky. As the sun drops further below the horizon, the shades will gradually deepen, ultimately blanketing the pool in darkness.