Up Periscope
A periscope is a really handy tool. It could see over walls and around corners! The periscope could be a long tube or a short box. I made my periscope out cardboard from a box. It’s a long rectangle with two holes on parts. (Square holes work best). The first step is to lay the cardboard flat. Divide that into four sections. The first section has a square hole in the top left corner. That’s what you’ll be looking through. Then cut out another square hole in the 3rd section on the bottom. Fold the four sections. Then tape them together. Then hold your periscope upwards so that one square hole faces left on the bottom and another one on the top facing right. Cut out slots for the mirrors. The top mirror has to face outwards and facing downwards. The bottom mirror has to face outward and upwards. Look in and see if you could see over across the room image. If the mirror keeps slipping out that means put a piece of cardboard on the slot and tape it on. Do this on both sides and both mirrors. How the periscope works is that light rays ahead of you go into the periscope (upper part). As it goes in the rays hit a 45 degree angled mirror (45 is at a slant) facing down. Then the light bounces down to another mirror facing up so it goes into your eyes. It’s amazing what science can do!