The Swedish geographer Torsten Hägerstrand (1916-2004) was a pioneer in the study of Time Geography. A key part of his work was the development of methods for visualising worldlines. Most commonly he used three dimensional diagrams, with a 2D plane showing position on the ground, and the vertical axis time.
He called these visualisations spacetime aquariums.
Both images from HERE
He called these visualisations spacetime aquariums.
Both images from HERE
