Yellow Periscope / mobile phone accessory

It’s customary nowadays for people to take pictures of themselves using cell phones.
Some smart phones even have a secondary lens to allow users preview the pictures before taking it.
Unfortunately the quality of secondary lens is never near that of the primary, resulting in lots of regrets or even anger.
Add on the Yellow Periscope, and you may use your primary lens to take quality pictures of yourself with the same convenience of the secondary lens!
The plastic (with optical prisms) periscope is attached, using Scotchcal, over the primary lens to receive the redirected images, so the user can still preview pictures using the screen.