You're misunderstanding this nimbus. The light cones are tilted. The degree of "spacetime tilt" relates to the force of gravity and to how much a light beam will curve. The spacetime curvature relates to the tidal force. But it does. That's what Tom Moore and others have said. If you don't think it does, try to explain why the vertical light beam doesn't get out of the black hole. Like Don Koks said, the ascending light beam speeds up. Remember me saying that it was counterintuitive? See this bit of his reply here: http://www.sciforums.com/threads/qm-gr-black-holes-cannot-exist.142658/page-34#post-3240237] "...light speeds up as it ascends from floor to ceiling (it doesn't slow down, as apparently quoted on your discussion site), and it slows down as it descends from ceiling to floor; it's not like a ball that slows on the way up and goes faster on the way down. Light travels faster near the ceiling than near the floor. But where -you- are, you always measure it to travel at c, because no matter where you place yourself, the mechanism that runs the clock you're using to measure the light's speed will speed up or slow down precisely in step with what the light is doing." Light doesn't do this because spacetime is curved. Or because space is curved. It does it because space is inhomogeneous. Because a concentration of energy tied up as the matter of the Earth "conditions" the surrounding space, this effect diminishing with distance as per the plot of http://en.wikipedia.org/wiki/Gravitational_potential]gravitational potential on Wiki. If you placed light-clocks throughout an equatorial slice of space and plotted the light-clock rates, this is what you'd see. And they're light clocks. The rubber-sheet depiction is showing you the variable speed of light. They don't. On one day alone 84 were purchased. And not by me or anybody to do with me. NB: Something is going wrong with the hyperlinks.