Mannheim, Germany-based street art duo known as Zebrating have been creating those hidden street art on railings in public spaces. Different from the normal street art, these elusive graffiti work can only be seen from certain angles. Despite being out in the open for anyone to take notice of their work, it’s quite easy to miss if you’re not paying attention. For the same reason, if you do find it, it certainly is a hidden treasure which offers a pleasant surprise for viewers. So make sure to keep your eyes open and take in your environment, maybe some hidden art like these are waiting for you to discover.