The New York Public Library has released a new website called The Stereogranimator, which allows patrons to create their own animated files or 3-D images from the Library's collection of stereographs, a popular 19th Century photo format. The web project gives this important, historic medium new life, and also highlights the work of NYPL patron Joshua Heineman, who started creating his own moving images from Library stereograms as an art project for his blog. The Library's NYPL Labs team was so impressed it decided to build on his idea. Here's his story about how the idea took shape and grew into a Library project.