Of the 3 stages of metamorphosis, the pupal stage is most intriguing. In the larval stage, one can see the caterpillar moving around, chomping all the leaves and excreting fraps. You can also see the caterpillar growing in size from one instar to the next. The adult butterflies or moths are of course flying around, feeding or copulating to ensure the continuation of the species. Once the caterpillar turned into a chrysalis or cocoon, nothing much seems to be be happening on the outside. Does the caterpillar dissolves into a soup and transform itself into a butterfly or moth as popular myth has it? So what is really going on inside a pupa? To find out how a caterpillar turns into an adult, one needs to be able to peep inside the pupa without disrupting the metamorphosis process....yes you guessed it, one needs to have X-ray vision! Since I am already familiar with the use of X-ray in my floragraphy work, I applied these techniques on a pupa of a Psilogramma menephron (special thanks to the late lepidopterist David Mohn who donated this pupa for the advancement of science).