A big green beetly thing in タマムシ "jewel beetle" (Chrysochroa fulgidissima)
Since this bug has iridescent wings that glow lengthwise with different colors depending from the light angle, one cannot be sure about which color it exacly is. Therefore it gave rise to the expression tamamushi-iro (tamamushi color), in reference to a convoluted statement that can be interpreted in more ways than one. The term tamamushi-iro is used in the context of Japanese officialdom, when politicians or bureaucrats use language that is unclear."
[photographed on our neighbour's wall]