Just what it says on the tin, really! This specific aesthetic was my childhood, and I'd love to know if there's a name for it already floating around somewhere. Basically put, this is an aesthetic that is centered around approaching life with childlike wonder. Visually, the colors are a lot more vivid than as is the case with adventurecore/naturecore, as well as any adjacent aesthetics (cottagecore, goblincore, mori kei, etc.), and the main motifs are nature (obviously), whimsical imagery, children's stories and illustrated cartoons set in nature, exploration, simplicity, and unity with others/community and with the natural world. I attached a few visual examples below. Is there any pre-existing aesthetic like this at all? Sorry if this is a bit vague; I tried to describe it as best as I could!