During larval development, tissues known as imaginal discs grow inside the larva. Ash1 was discovered as a gene causing an imaginal disc mutant phenotype in Drosophila. Pupal and adult tissues form from imaginal cells. Interventions such as imaginal exposure therapy combine both approaches. A long imaginal aestivation and hibernation period is an uncommon overwintering strategy among agromyzid flies. The theosophy of post-Renaissance Europe embraced imaginal cognition. The adult structures grow from imaginal discs. Cells that will produce adult structures are put aside in imaginal discs. However, these experiments have not been replicated in imaginal wing discs. The role of the imaginal disc in insect development was first elucidated by Jan Swammerdam. Creating imaginal or fictional characters to represent these customer segments or communities followed. Dragon is mysterious animal made real and imaginal animal's strength. The questionnaire, called the Imaginal Processes Inventory (IPI), has been used to investigate daydreams. Imaginal discs in insect larvae are examples of morphogenetic fields. Imaginal exposure is repeated 'on-purpose' retelling of the trauma memory.