A whimsical illustration depicts kidneys as "Filter Fields" with small workers, showing a blood river flowing through them to a bladder.

A peaceful countryside scene called “Filter Fields” stretches out under a bright blue sky. In the center are two tall, red-brown bean-shaped buildings — the Left and Right Kidney Towers. A clear, sparkling River of Blood flows in from the hills, entering each tower through large golden gates (renal arteries). Inside, workers in blue overalls called Nephron Workers run intricate conveyor belts and sieve-like filters that sort the river’s cargo: fresh water, nutrients, and waste. Barrels of “Keep” (nutrients, clean water) are sent back into the River of Blood, while waste crates are sent down winding yellow canals (ureters) toward the Bladder Reservoir in the valley below. Outside the towers, lush green fields thrive from the pure water they release, while waste is securely stored until the “Exit Gate” opens. Sunlight pours down, symbolizing energy and life sustained by this constant, careful filtering. See more