English: The x-axis (left/right) represents time, the y-axis (top/down) represents space / geolocation. The further right, the closer you are to the present, the further left the more you go in the past. Time is given in a rational scale - the 20th century gets much more space than the 1st century. The y-axis represents latitude, with the Equator in the center of the image. Every item is being put at its latitude (averaged, if several) and at its earliest point of time mentioned on the item. For items without either, neighbouring items propagate their value to them (averaging, if necessary). This is done repeatedly until the items are saturated.