What if windmills looked more like trees? Well, a team of engineers at Ohio State University is looking for answer to that question with structures that resemble trees, but actually create energy when they move in the breeze. That swaying motion from the wind, and the resulting structural vibrations, is converted into electricity with electromechanical materials such as polyvinylidene fluoride (PVDF). The project isn't merely concerned with those tree-like structures, though. It also looks to harvest the energy generated from the vibrations of buildings and bridges.