An impossibly colossal vertical wall-city rises from a dark forested plain, its sheer cliff-like facade hundreds of miles tall, crowned by a flat plateau where white clouds drift along the top edge. The face of the megastructure is carved with cascading vertical city layers, glowing windows, and waterfalls of light that pour down its surface. A winding orange-glowing highway, crowded with tiny vehicles and people, curves up from the dark green forest below and spirals toward the city entrance. The forest stretches endlessly beneath, dotted with warm lights. Rendered in epic retro sci-fi concept art style with dramatic scale, atmospheric haze, warm-cool color contrast between the fiery road and the cool blue megastructure, and a sense of pilgrimage toward an impossible destination. Highly detailed, cinematic composition, awe-inspiring, matte painting quality, 1970s-80s paperback