Do you want to keep an eye on two things at once ?
Here's a way to do so
You can sneak up on people through covers or behind wall,fence,etc
It's just like a periscope
Step 1: Things Needed
You will need things like two rectangle boxes,scissor,tape,mirror,scale
Step 2: Attaching the Two Boxes Together
attach a piece of tape,flip it and attach another tape
Step 3: Cutting the Box
Step 4: Fitting the Mirrors
fit mirror on both sides and its ready for some spying
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Please be positive and constructive.