First pick a neutral base—white or light gray walls, a simple floor. Then add a single statement piece that acts as the “stream.” A slim, freestanding desk or a wall‑mounted floating shelf can hold a cluster of items, but keep the surface clear. Use clean, straight lines for furniture—think rectangular shapes, no curves that clutter the eye. Let the stream of ideas be represented by a small, well‑ordered arrangement of books, notebooks, or a low‑profile plant. Keep the color palette muted, add one accent color in the objects, not in the walls, to keep the space feeling open yet focused. Finally, keep the lighting simple: a linear LED strip or a single track light. That way the room feels like a flowing idea space but stays tidy and organized.