Heh, it's good to know I'm not the only one snapping shots of construction sites in Tokyo. I was surprised by how well they dampen the noise so as not to bother the surrounding areas. Also, every site had those same white perimeter privacy walls. I wonder if that's mandated for all projects.
Oh yes. The noise. Especially in this area: http://i.imgur.com/fuz85Fu.jpg Also the marginal dirt traces on the road. Fascinating. I wish I could have photographed the site for a longer span of time.