Kyle McDonald on Twitter: "if you've ever tried to use a smartphone while wearing polarized sunglasses, you've seen how the screen "dims". i've dreamt of using this technique to build a camera
Why, when wearing sunglasses, can I view my phone very well vertically, but it disappears when I turn it horizontally? - Quora
![iPhone Owner Installs Privacy Filter That Requires Special Glasses to See What's On the Display - TechEBlog iPhone Owner Installs Privacy Filter That Requires Special Glasses to See What's On the Display - TechEBlog](https://media.techeblog.com/images/iphone-privacy-screen.jpg)
iPhone Owner Installs Privacy Filter That Requires Special Glasses to See What's On the Display - TechEBlog
![How to make a computer screen INVISIBLE: Scientist shows how to make your monitor blank to everyone but you using 3D glasses | Daily Mail Online How to make a computer screen INVISIBLE: Scientist shows how to make your monitor blank to everyone but you using 3D glasses | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2013/10/30/article-2480089-191455DB00000578-365_636x382.jpg)
How to make a computer screen INVISIBLE: Scientist shows how to make your monitor blank to everyone but you using 3D glasses | Daily Mail Online
![TIL - using the HTC 10 (when wearing polarized sunglasses) you can't see the vertical screen. Only portrait mode is visible. : r/Android TIL - using the HTC 10 (when wearing polarized sunglasses) you can't see the vertical screen. Only portrait mode is visible. : r/Android](https://external-preview.redd.it/pNvPwz_BntxnIzGC1PtMMH0PDjSRGv9cTdffWJKS1HQ.jpg?width=640&crop=smart&auto=webp&s=88726287611b6218e6a53f210a5b008ba67b5ccd)