The layers at Fort Jefferson weave together aqua waters, weathered brick walls, and the expansive blue sky, creating a picturesque scene that encapsulates the historical and natural elements of the fortress. Here's a vivid portrayal of these layers:

**Foreground: Aqua Waters and Coral Reef:**
- **Crystal-Clear Waters:** In the foreground, the crystal-clear aqua waters of the Caribbean Sea take center stage. The transparency allows a glimpse into the vibrant life of the coral reef beneath.

- **Living Coral Reef:** Beneath the surface, a living coral reef thrives, adding bursts of color and movement. Staghorn coral, sea fans, and schools of fish create a dynamic underwater tapestry, establishing a connection between the fort and the marine environment.

**Midground: Weathered Brick Walls:**
- **Historic Brick Walls:** Rising from the sea, the midground features the imposing, weathered brick walls of Fort Jefferson. The bricks, softened by time, showcase the historical resilience of the fortress against the elements.

- **Coral Adornments:** Coral formations adorn the brick walls, creating a unique fusion of history and nature. The coral, thriving on the bricks, adds a layer of organic beauty to the solid structure.

**Background: Expansive Blue Sky:**
- **Vast Blue Sky:** Above the fort, the background showcases a vast, cerulean blue sky. Wispy clouds add a touch of dynamism to the expansive canvas, connecting the terrestrial and celestial realms.

- **Open Horizon:** The open horizon emphasizes the fort's isolation, surrounded by endless skies and seas. The blue sky becomes a symbol of freedom and expansiveness.

**Interplay of Light:**
- **Sunlight Dance:** Sunlight bathes the scene, filtering through the water and casting dappled patterns on the coral reef below. The interplay of light enhances the colors of the underwater world and creates a dynamic contrast with the brick walls.

**Human Presence:**
- **Silhouettes of Explorers:** Silhouettes of snorkelers and divers explore the underwater wonders, adding a human touch to the scene. Their presence emphasizes the accessibility of Fort Jefferson's unique underwater environment.

- **People Along the Walls:** Along the brick walls, people stroll, exploring the historical remnants and enjoying the juxtaposition of man-made structure against the natural beauty of the surroundings.

**Emotional Essence:**
- **Harmony and Contrast:** The layers at Fort Jefferson evoke a sense of harmony and contrast. The interplay between the aqua waters, brick walls, and blue skies creates a captivating tableau where history and nature coexist. It's a visual symphony that invites contemplation, appreciation, and a deep connection to the layers of time and beauty present at this remarkable fortress.