If you've made a print or an image that contains an anamorphic optical illusion, your audience needs to know where to stand to see the privileged point of view. This is a simple box. shaped like a phone, that fits into a phone clamp on a tripod, making this a very easy thing to implement.

Simply print the box and mount it, then situate the tripod to help your audience see the illusion. I used this for the work below.