Did you read these as a kid? I did! A Wrinkle in Time is fairly ubiquitous but I was always fixated on A Swiftly Tilting Planet, where the gang ends up with defiant mitochondrial mice dancing a death dance around a sacred tree. They also go fuck around at Noah's Ark in Many Waters. The memory of these books are opaque to me as an adult and I plan on doing a deep read this year where I reread and then try to understand L'Engle's meaning while comparing and contrasting about the values I took from them as a kid. A very complex and readable children's series, low fantasy, soft sci-fi, shades of religious ecstasy.