In a vertical 4:5 portrait orientation, draw a wide, low,...

In a vertical 4:5 portrait orientation, draw a wide, low, eye-level view from the valley floor straight up the middle, with perfect vertical symmetry: a small bone-white house with a single round tree stands on the valley floor at the bottom, and an identical house with an identical tree hangs upside-down on the ceiling directly above it, with a narrow band of sky and a single cloud between them. The curving land fills the left and right sides. The whole image is a bold graphic illustration like a high-end hand-inked comic book or screenprint, with crisp black linework, fine cross-hatching and stippled shading, large areas of flat saturated color and a very slight printed-paper grain, with no blur, no haze, no glow and no lens effects. It uses a strict limited palette: a deep ultramarine-blue sky and river, dark forest-green farmland with lighter leaf-green on the sunlit fields, warm bone-white buildings and stone, and jet-black ink shadows and lines, with no other colors. The huge, towering cumulus clouds are bright white with fine ink contour lines and soft blue-gray shading. The world is the inside of an enormous cylinder: the valley floor curves up steeply on both sides and keeps curving until the two halves of the land meet overhead, so the farmland, river and buildings on the ceiling hang upside-down above the viewer, with a long narrow band of ultramarine sky and towering clouds between them, and every shadow is sharp and short. The curving land fills at least half of the frame. The light is bright, hard daylight with no sun in the frame. The mood is quiet, still, vast and dreamlike. There are no people, no text and no logos.