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Naturally occurring composite multiscale photonic structures with variable structural colors.(A)The maleChlorophila obscuripennis beetle;its elytra displays an inconspicuous iridescent bluish green color.(B)Optical microscopic image of an elytron under 1,OOO× magnification. It is composed of a framework composed of green hexagonal veins and a cyan center. (C) SEM images of top view (left) and transverse cross一section (right) of the outer elytral surface. The elytral surface comprises of an array of hexagonal pits.(D)TEM transverse cross section of the ridge (top) and basin regions (bottom) of the outermost elytra.