Bay seniors thinking of upgrading their travel photos may want to visit the Rayko Photo Center in SOMA. Don’t procrastinate. Next Tuesday and Wednesday are the Perimeter of the World installation’s last days. There are dozens of startling photos in a variety of formats from around the globe. If you are ready to move on from snapping your grandkids with your cell phone and get serious Rayko offers a vast range of workshops on subjects from lighting and historical processes to digital.