http://ds106.us/2011/01/10/averaging-concepts-using-flickr/

For this visual assignment, you were to take 50 images from a flickr search and average them all together.  There were step by step instructions for this but not for the version of photoshop I have.  So instead of an easy couple of clicks, it turned into me adjusting the opacity for each individual layer.  The bottom layer being at 100% (1/1), the 2nd layer at 50% (1/2), 33% (1/3) and so on.  A little tedious but it got the job done.  I searched the term “rugby” and here is the average of the 50 images: