The Persistence of Memory T-Shirt - Unisex - Developer Gear 100% Cotton First, memory consisted of lightning arcs crackling through our brains. Then we recounted our lives on caves in places like Lascaux and Altamira. The Stone Age gave way to stone tablets and papyrus gave way to punch cards as our need for memory became the need for data storage. Our memories became paintings then writings then analog code as our attention spans grew ever shorter. Now, memory consists of lightning arcs crackling through a computer network somewhere. This dreamy blue shirt is made of 100% cotton and is both lovely to look at and easy to memorize. Cloud computing, memento mori. 100% Cotton and available in multiple sizes. See sizing chart in images for info. From the Unemployed Philosophers Guild. Don't worry. We are employed, just not as philosophers. UPG is a small, Brooklyn based company specializing in gifts for the sophisticated gift giver. Click on our brand name near the product title on this page for more presents of mind.