The Tesseract Scene
In this sequence, the character Cooper finds himself inside a tesseract, a four-dimensional representation of space and time.
Inside the tesseract, he can see and interact with different moments in time, represented as distinct points in space. This allows him to perceive his daughter Murph at various ages, experiencing events from her past and future simultaneously.

For some, it's peaceful rest, or perhaps what they've always wished for...but for others, it is a part of them that is hard to see gone forever.