Morpho
Butterfly Wings

The back side of a morpho's wings has a distinctive pattern of "eyes",  This is the view you would have when the butterfly is sitting with it's wings closed,

Morpho Achillaena		Morpho Godarti

Many members of the Morpho family have iridescent wings.  The scales on their wings are layered with the reflecting scales being particularly thin and transparent lamellas. The colors you see on the butterfly's wing is the color that is being reflected by the scales.  Different colors have different wavelengths so the angle at which the light hits the wing and is then reflected to your eye will change the color you see.  Blue morphos will appear light blue to green.  Some Morphos, like m.Godarti, have wing scales so thin that they are transparent from certain angles.  On these butterfiies the "eyes" are then visible through the wings.

reflecting and non-reflecting scales the reflecting scales have a finer structure	the reflecting scales are the ones on the right	At the edge of the wings  the scales are more than two times as long as the ones in the middle. of the wings  the scales are more than two times as long as the ones in the middle.	At some angles

Butterfly scale pictures from
	Think Quest: Butterflies on the Wings of Freedom
		Shapes of scales
		Why do some wings idesce