"Design a futuristic floating house situated in water, without any trees in the background. The house should have a pyramid shape with an observatory for stargazing and a serene interior that blends modern minimalism with natural materials. Construct the exterior from elegant marble featuring a textured finish, with golden rod window frames and vibrant, watery tones in shades of teal, aquamarine, and deep blue. Ensure the house is the focal point, partially submerged in the vast ocean under clear blue skies. Create a tranquil atmosphere that promotes relaxation and a deep connection to nature, all in 4K high resolution, highlighting the beauty and elegance of the materials."