The idea is to turn the plexiglassboxes so the container wil drop into the one below. Once you have logged, you put the container back in the tube in the top so it will fall back in the upper box. Its like an outdoors version of downfall
Other pinner says: "My new life plan is to start being a rogue fairy house maker. So unsuspecting children can stumble upon my work and be overjoyed." This would be so cute if we had young kids on the property.