These images and videos were created by combining images saved from Calvin’s public webcams through one school year (specifically, August 15, 2013, through May 23, 2014). The saved images span this whole date range in half-hour increments with few gaps. The merged images and videos were created using software written for this specific purpose.
Each image fades from August on the left to May on the right. An image is chosen from each day, and stripes from these images, overlapping a few of their neighbors, are blended together. This blending means things like people, vans, tables, etc. don’t show up in the final images.
Each video takes a frame from each available day (which is almost every day between August and May) and shows them one after another.