The owl butterfly is one example of this ... It looks just like a rolled-up, dry leaf, but the wings are actually flat. The curling illusion is produced by an effect called countershading - in this ...

In the culinary world, it means cutting something almost in half, leaving the food connected at the bottom so it splays out flat ... one big piece -- like butterfly wings. Carefully lift the ...

A vapour sensor based on an exact replica of the butterfly-scale design will most probably be unable to selectively quantify more than ten individual vapours from their mixture. A man-made ...