Seven Dimensions

The Seven Dimensions, also known by the technical name Seven Axis 7軸 (nana-jiku), are the different planes that form reality in the Universe of EXA_PICO. While they were never mentioned in the Ar tonelico Series, aside of a few brief mentions to the Time Axis in technical explanations about the nature of Song Magic, they play a central role in the storyline of the Surge Concerto series games, particularly in Ciel nosurge: Ushinawareta Hoshi e Sasagu Uta, and moving through them is known as an Axis Movement or Axis Shift, which is the main characteristic of the power known by the name Overlooking Viewpoint.

The Seven Dimensions are as follows:

First to Third Axis - Space
The first to third axis, or first to third dimensions, comprise the tridimensional Space as we know it, formed by the X, Y and Z axis. Needless to say, it refers to the physical space where all kinds of waves flow about and interact among themselves.

Fourth Axis - Time
The fourth dimension corresponds to Time, going from the macro scale of light years to the micro scale of nanoseconds, formed by the T axis. This corresponds to all the events that have taken, are taking and will take place in any part of the Space.

Fifth Axis - Possibilities
The fifth dimension corresponds to the Possibilities, and it is formed by the I axis. To put it in a simple way, this refers to parallel universes: in other words, to the possibilities resulting from the same world having gone through different events that can go from a person taking a different decision to events that can modify the entire universe. However, this Axis is intrisecally linked to the following one due to reasons that will be explained further below.

Sixth Axis - Qualia
The sixth dimension comprises the C axis, and it corresponds to the Qualia, which in Ra Ciela's terms means "the point of view that each soul has". In other words, to the consciousness, knowledge and history every single person, living being and object are supposed to have within each position in the Fifth Axis, or possibility. Therefore, both axis are inextricably linked due to the fact that each possiblity has its own Qualia.

Seventh Axis - World
The sevent and final dimension known corresponds to the World itself, though its axis is not known yet. To put it simply, it comprises an entire world: its possibilities, space, time and Qualia are all contained within a point in the Seventh Axis, while the other points correspond to entirely different worlds from the Universe of EXA_PICO itself, of which there is no knowledge available.