Emergent Sparkle Pupa Grey - Larva & Pupa. The Grey Emergent Sparkle Pupa was originally created by the late Gary LaFontaine. After writing a research paper on Caddis Flies, La Fontaine discovered that Caddis flies can have an air pocket on them. The Grey Emergent Sparkle Pupa is the first imitation to be created of this unique situation, which is the fly trying to escape to the surface. This fly is sure to be spotted by any trout in the area as the loosely tied antron will hold air similarly to the real fly.