Each tile is roughly .5 miles by .5 miles. The shading represents the number of Divvy bikes checked out in that region within a 15 minute window on an average July weekday in 2019.

Notice the spikes during rush hour as well as lunchtime!

Data from https://data.cityofchicago.org/, downloaded with RSocrata

Plots made with dplyr and ggmap

Animation made with ImageMagick