![For upper-grade boys! Simple yet awesome craft project [Don’t call it lazy]](https://i.ytimg.com/vi_webp/9at8TLsZnlE/maxresdefault.webp)
I want to make something for my summer break craft project that makes people say “Wow!” but I’d like to avoid anything too difficult.
Great news for upper-elementary school boys! In this article, we introduce intriguing craft projects with clever mechanisms you can build using everyday materials.
Even creations that look complex—like a fountain where water seems to flow upward or a spinning top that floats in midair—are actually surprisingly easy to make.
Once you finish, you can submit your project with an explanation of how it works and use it as a science project, too.
Go ahead and try these fun crafts that apply principles of physics!
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Crafts to learn how things work (1–10)
dial safe (combination safe)
You often see combination safes on shows like Antiques Appraisal Team and police dramas.
If you want to amaze your friends and teachers, try making your own combination safe! The materials are simple, but the result looks impressively authentic.
Use cardboard for the body and bottle caps for the dials to make it eco-friendly, too.
The dial mechanism is also made from cardboard and wooden skewers, so you won’t need any hardware or tools.
After you’ve made it, you can play with the safe or even use it as a treasure chest.
Goggles that let you see behind you
These are magical goggles that let you see behind yourself even while looking forward.
By placing mirror sheets inside goggles made from cardboard, let’s create a fun world where you can see what’s behind you.
Cut cardboard to the size of the goggles and glue it together using both white glue and a hot glue gun.
Using two kinds of adhesives helps keep the cardboard from coming apart.
Attach mirror sheets cut to square pieces of cardboard, then glue them inside the goggles.
Add the viewing holes and the top piece of cardboard to finish.
Enjoy sights you normally wouldn’t be able to see!
pinhole camera
Let’s make a pinhole camera that uses the properties of light.
Light travels in straight lines.
By using this property, light coming from the subject passes straight through the small hole in the pinhole camera and forms an image.
Build the camera body with craft paper and line the inside with black construction paper to prevent light from leaking in—that’s the key point.
Instead of an internal screen, you can attach a camera to record the projected image.
If you replace the pinhole with a convex lens, you can enjoy an even sharper image.
By the way, the image will appear upside down compared to the actual scene.
telescope
Believe it or not, you can make a telescope using only items from the 100-yen shop! Doing some stargazing with a handmade telescope sounds really exciting, doesn’t it? If you’re an elementary school student interested in making things or in astronomy, definitely give it a try! The key is to combine reading glasses and a magnifying glass for the telescope’s lenses.
It’s surprising that a potato chip tube is just the right size for the telescope body.
It’s fine to observe the Moon with your finished telescope, but be sure never to look at the Sun! Have fun making a telescope you can proudly show off to your friends and family.
A truly usable cooler made from cardboard
Here’s a DIY cooler idea using cardboard, plastic bottles, a battery pack, and a motor.
First, cut three circular holes in the side of the cardboard box, each the same size as the bottom of a plastic bottle.
Insert and secure plastic bottles cut to one-third length into the holes, using the bottle neck ends.
On the inside of the cardboard, attach a propeller to the side opposite the bottles, and make small holes on both sides.
Mount the motor’s switch on the lid, place ice packs inside, and close the box to finish.
Decorate as you like with vinyl tape or similar materials.
tensegrity
Tensegrity refers to an objet d’art that looks as if it’s floating in midair, created by balancing tension members and compression members.
That description might make it sound like you need special materials, but in fact you can make one easily with familiar items like cardboard, sewing thread, or yarn! However, because the piece is sustained by a delicate balance, you’ll need to measure the thread lengths precisely and make fine adjustments over and over until the balance is just right, finishing it carefully.
It might be the perfect craft for kids who are good at detailed work or who enjoy science experiments.
Projector
Let’s try projecting your favorite videos from your smartphone with a projector.
A projector is a device that projects images and videos onto a large screen, but you can actually make one with cardboard! Cut a circular hole in the side of the cardboard box that’s about the same size as the magnifying glass lens you’ll use.
Attach the cut-out cardboard circle to the inside of the box on the opposite side from where you cut it out.
This is where you’ll place your smartphone to play videos or display images.
Attach the magnifying glass to the cut-out section inside the box, close the lid, and you’re done.
It’s simple to make and inexpensive, so feel free to give it a try.