Coral reef
A living undersea structure built by many small creatures — collective architecture grown across generations.
A coral reef in a dream is the dream's image of collective architecture grown across generations by many small creatures. No single coral built the reef; the structure is the cumulative work of lives that were each, alone, almost invisible. The dream brings the reef when something in your life — a tradition, a culture, an institution — has been built by people most of whom will not be remembered by name. A reef alive with fish is the dream affirming that the long collective work is still hosting life. A reef bleached and empty is the dream noting that the conditions the structure needed have changed, and what generations made is now being lost in the span of a single life.