Very high magnification view of cilia beating in real time. Video images were improved with noise reduction and contrast enhancemnent to make this motion visible. 400x magnification was used to relay the image to a newvicon tube camera, and differnetial interference contrast light microscopy to form the primary image. These were human airway epithelial cell cultures obtained from the UNC Cystic Fibrosis Center and grown in our laboratory. Each cilium is about 7 um long, and they can beat at up to 30 times per second, although those shown were much slower.