Mushishi, Kaijuu no Kodomo Recommendations
Both shows allow the natural world to flourish organically as it intertwines with the plot. Both also have characters who approach the world philosophically and scientifically in their own ways. Finally, both emphasize how little humans (May ever) know about nature, and emphasizes the ways in which people are captivated by its beauty, mystery, interconnectedness, and danger. There’s a sense of magical realism with each and its visually stunning.
Both are very much focused on nature and how the world works, both the seen and unseen world. Both are very 'spiritual' experiences that can alter your world view. Very beautiful animation and sound design.