Conical containers for small belongings.
The container is sealed only halfway, behind which the contents are normally hidden. A gentle push rolls the opening downward to enable retrieval of the contents, and releasing the cone brings it back to the original position by its internal weight.
The shallow cones are good for holding small items like paper clips, and the deeper ones are good for holding long, thin items like pens and pencils. One had the perfect angle for a mirror, so an accompanying mirror was developed.