In 1936 two architects—Louis Skidmore and Nathaniel Owings, both from Indiana—set up a firm in Chicago, a city that would prove a fertile ground for their work. Three years on, John O. Merrill joined the firm, prompting a name change to Skidmore, Owings and Merrill (SOM). Now you can travel through all those 80 years of SOM‘s practice with their Tumblr blog.