In the spring of 2015, Art found some butterfly eggs on his garden patch of stinging nettle. He set up a mesh enclosure in his house and added some stinging nettle stems and leaves in a jar with water to provide food, and then collected two of the eggs — he left the rest to grow naturally. [There are instructions on how this is done here. Be sure to release the adults back where you got the eggs.]
Over time, he photographed the caterpillars, cocoons and the emerged butterflies. Here are some of the pictures.