What do butterflies and bubbles have in common?

Biologists discovered Buckeye butterflies with blue wings, leading to research on how structural colors are created by tuning the thickness of the lamina in butterfly wings. This understanding could help engineers develop photonic nanostructures for various applications, such as solar panels and cosmetics.

What is the significance of the structural colors created by the Buckeye butterflies?

What future research directions are suggested by the findings on butterfly wings?