"Not to be seen" augmented reality AR filter for Instagram is now available for iOS and Android. Scroll down to install.
Back in 2013 German filmmaker idol Hito Steyerl gave a series of practical advice entitled "How not to be seen", including a lesson in DIY facial camouflage "How to become invisible by becoming a picture". Unfortunately (mostly due to advanced makeup skill requirements) it never turned mainstream.
Following Hito's instructions and making them accessible for everyone today, facial camouflage has finally been transformed into a free AR-filter for your everyday-use and protection.