now i want to understand the difference between alpha and transparency. here i slapped the rectangular pattern in the alpha of the one wing.

so i am guessing alpha modifies the "colour" (light reflection to observer?)) and transparency the "shape" or density (light transmission?)? but the alpha also affects the colored shadow?!? and where would i need different maps?

and what is the difference idea of connecting nodes via grayscale or alpha?

i just hope my curiosity is killing no cats!