Canada Maple Leaf Pinhole Projector used to view solar eclipse.
Background: NASA released (https://eclipse2017.nasa.gov/3d-stl-files) 3D printable files for Americans but forgot about Canada. I designed a Canadian themed viewer.
1) Have your back to the sun
2) Hold up the pinhole projector about 3-4 ft away from a blank sheet of paper
3) You should be able to see the moon covering the Sun.
Safety! DO NO LOOK INTO THE SUN!
Edit: added a blank pinhole projector