It’s all in your perspective, and maybe influenced by your specimen. The wide variations in nature are amazing.
I had searched for “Brown Butterfly” to identify this new to me butterfly and even used that to name my post. I didn’t find any matches.
It turns out it is identified using white as the primary color: the White Peacock Butterfly. If I had seen this second butterfly photographed later the same day first I might have searched differently. Or maybe not!