We find design elements from activities or phenomena of nature. It is a very natural activity that birds fly and seek for insects. We think that a product repelling insect should be inspired by natural phenomenon as it is.
Birds think that cages are their nests and take a rest at the place. A place where they want to relax, not a closed space. By slightly indenting downwards, the shape of the product is simplified and symbolized as if a bird wants to enter the cage for relaxing.