A minimalist concrete courtyard architecture, serene and zen-inspired, smooth flowing curved concrete walls forming an enclosed courtyard, walls gently blending into a pale blue sky, seamless and sculptural design. A single solitary tree planted at the center on a circular concrete platform, symbol of calm and balance. Soft natural materials, minimal details, no people. Morning sunlight at 10am casting gentle yet clear contrasts of light and shadow across the floor and walls. Peaceful, contemplative atmosphere, Japanese zen aesthetic, modern architectural photography, ultra-clean composition, soft shadows, high realism, 4K resolution, cinematic lighting, wide-angle view, minimalist design, tranquil mood.