Geometric Abstract Facade: Architectural Scale Composition of Color Blocks and Lines

Design a hard-edged geometric wall artwork at building scale, with no image and no message. Show a long blank concrete retaining wall some sixty metres in length and five high, treated as a single abstract composition of flat colour fields and straight lines — large rectangles, diagonals and narrow bands — arranged asymmetrically so the eye travels along the wall rather than resting at a centre. Detail the palette as limited and confident: four colours only, a deep ultramarine, a warm ochre, a soft grey-white and a single narrow accent of vermilion, with generous areas of bare unpainted concrete left as a fifth tone. Show every edge as absolutely crisp with no brush texture or overlap, the boundaries between colours as sharp as printed matter, achieved by careful masking. Detail the composition as responding to the wall's real features rather than ignoring them: a colour boundary aligning exactly with an existing expansion joint, a band stopping short at a drainage outlet, a rectangle framing a services access panel. Show the wall's full length in a long oblique view so the composition compresses and the sequence of colours reads as a rhythm. Detail a pavement and cyclists in front for scale. Set it along an urban route. Show flat bright daylight. Photorealistic, graphic, four flat colours on grey concrete, long oblique view.