"Design a modern isometric 3D banner background for an alternative asset investment platform, featuring people bidding and exchanging art and collectibles in a futuristic marketplace setting. Use clean, geometric shapes and soft gradients in light, pastel tones like soft blues, muted golds, and light pinks to create depth and dimension. Illustrate people interacting with 3D isometric art pieces, rare collectibles, and upward-trending charts, giving a sense of activity and engagement. Incorporate digital interfaces and bidding platforms in isometric perspective, creating a dynamic, tech-forward environment. The backdrop should include an isometric city skyline with sleek, minimalistic buildings, softly shaded with gradients to evoke growth and opportunity in a modern, structured way." --ar 3:2