Time exists in an element of 4D, where we canot perceive it as in three dimensional world. and This peculiar structure of time is called ‘Tesseract’, a cube in a four dimension. 

Time exists in an element of 4D, where we canot perceive it as in three dimensional world. and This peculiar structure of time is called ‘Tesseract’, a cube in a four dimension. 

In Interstellar the protagonist navigates through the past, present, and future in this structure called Tesseract. You can freely roam around time here .

This Tesseract Scene is also, said to have imagined to construct Physically. As such, the structure of tesseract can be imagined in various ways.