Nice visualisation of the world going to sleep and waking up again, courtesy of some clever people at Twitter. The look reminded me of spectrograms, which I’m sure would have some application somewhere in the world of multivariate stats or time series… Spotted (as so many good things are) at flowingdata.com. Well done to Nathan Yau for spotting Ramadan which nonplussed the Twitter guys. It also looks to me like there are late nights every weekend, and a spike in NYC for Thankgiving and one in both NYC & Sao Paulo for Easter. Or maybe I’m reading too much into it.