These can be either very simple (like the one I will show you how to make), or complicated. Google 'harmonograph' to learn more about the more complicated ones.
Step 1: Get supplies
- A large, strong, flat board. You can use a lot of different things for this part. I used a shelf from a bookcase.
-Weights. Get at least 5 pounds. More is better though.
-Pencil/pen. A pencil works better because it slides better than a pen.
-Duct tape. Of course.
-A book or other small object with some weight. Just about anything will work for this.
-A coat hanger, or dowel rod. A coat hanger is better. I'll show you why later.
Step 2: Find a place to mount the strings
You need to find a place in your house that has something near the height of the ceiling that can support 10 pounds while the weight is swinging. But there have to be 4 places to hold the weight up. These four places should be in a square formation too.
What I did was I went into my basement, lifted up the ceiling boards (Like the cheap ceiling schools have), and mounted the strings from a board that supports the floor above it.
I've heard of people using door frames as the mount. You can try a door frame, but I don't know how strong door frames are. So watch out.
If you can't find a place to mount the strings, you can usually find a place to hammer some nails in.
Once you find a place to mount the strings, find a chair, table, anything like those two things.
Now measure the four strings from the place that you're going to mount them at down to the chair/table's level.