Make easy spy gadgets with this fun and easy Letsfixit guide. Whether they’re imitating Inspector Gadget or have been reading “Harriet the Spy,” many children like to pretend they are spies. Secret gadgets and spy gear can spark days of imaginative play. Spy birthday parties are good creative fun, and creating a spy lair is an interesting way for children to pass rainy afternoons. You can create a lot of homemade spy gadgets using items around the house in less than an hour.
Keyhole Peeker - Cut out a piece of black construction paper 4 inches wide and long enough to wrap around a marble twice.
Place the marble against a keyhole and look into the other end of the paper tube. You will be able to see everything that goes on in the hidden room through the keyhole peeker.
Use the lemon juice as ink and the makeup applicator as a brush to write secret messages on the pages with grocery lists. The juice will dry clear, leaving only a page that looks like a scrap with a list on it. Pass the secret message to your spy partner. Instruct your spy partner to heat the paper in an oven or carefully over a flame, using adult supervision. The secret message will magically appear.
Place secret messages, money, "microfilm," or other small objects into the tube and replace the top. Place the lip balm tube in an innocuous place, like a desk top or on a shelf. You can pass objects to your spy partner using this device.