I have a question for all the geeks (like myself) that watch Game of thrones. The opening credits of the show depicts a three-dimensional map of the series' fictional world, projected onto a concave earth.
One of the things that strikes me about this world is the peculiar seasonal patterns, with years-long summers and winters. Now, I may be projecting a more science-fiction slant on something that is more likely of pure magic or some other supernatural cause, but the intro inparticular seems to have the world placed in what could be described as a Dyson Sphere/Shell.
Things in favor of this theory are:
1) The intro surface is represented as being concave.
2) The sun seems to be drifting about over the surface of the shell (or the shell drifting around the sun) - potentially explaining the odd shift of seasons for long periods of time.
3) Apparently, in later books which I have not read yet, there are references to lost ancient technologies.
4) While not evidence in favor, there could be some device or series of devices orbiting around the star to periodically block light, simulating night/day.
Things against the theory:
1) The whole intro may be simply nothing more than a stylized and artistic tool for presenting the world to the viewer and prepping them for the places they will visit in any given episode (the cities shown change from week to week).
2) The presence of stars & constellations.
3) The existence of the "Sunset Sea" to the west of Westeros. Suns in Dyson Spheres never set - at least, not in the conventional way.
Next question was “how is it lit?” And obviously, If you have a whole world inside a sphere, what would be in the middle of that sphere? The sun! Or whatever the light source of this world is.