Engineers creating antenna for cell phones and other wireless devices need an antenna that can have similar reception over many different wavelengths, which means it must have a similar structure at different scales: fractals! At top is an antenna in a cell phone based on the Sierpinski carpet; at center etched on a silicon chip is the Sierpinski triangle, and at bottom is our old friend the Koch curve (try the different shapes using the "Seed" dropdown menu). Other engineering applications include architecture, electrodes, seismology, and computer graphics.