What are the motifs in A Wind in the Door by Madeleine L'Engle?

The Interconnectedness of Life is a recurring idea. That all life is fundamentally interconnected is one of the main themes of Madeleine L'Engle's novel, A Wind in the Door. This theme is often associated with either Eastern or Native American religion and philosophy, but in A Wind in the Door it is presented through the lens of Christian mythology and supported by interpretations of science. Protagonist Meg Murry's parents are both highly respected scientists.