This is another diagram I took a picture of for this blog, that's like the last light-cone only it's slightly different, because it represents different times. The cone facing up is the Future Lightcone, and the one facing down is the Past lightcone.
The different between these two, besides the hourglass shape of this one is that any event (a point in the shaded region) in the Future light cone hasn't received the light yet but it will eventually. As time goes by, the event is closer and closer to the center. When it reaches the center is the exact moment when the light affects/reaches it.
After reaching the center, the event moves lower into the Past lightcone, where the light has already reached it.
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