STEM DIY Periscope (Ages 6+) Free, Registered

A periscope is an instrument allowing the user to see things even around a wall, corner, or other objects.  It is created using prisms or mirrors to reflect images through a tube or box.  Light from distant objects strikes the top mirror and then reflects at a 90 degree angle down the periscope tube.  

This program will allow you to create your own to take home!