That's “image stabilization” for those of you not paying attention. Or “VR” for the Nikon folks out there. I believe Canon and Nikon use very similar electronic systems. Either way, this is fascinating. This is what the inside of a Canon EF 28-135mm f/3.5-5.6 IS USM lens looks like when the image stabilization is operating.

Image Stabilization Revealed from Camera Technica on Vimeo.