There was some distortion of the taxi way markings agreed , but not enough to imply differences between 30 deg and 80 deg..Try it draw a circle and view it from different angles. That image was not captured on his film in his camera. Its interesting that people immediately commented on the subject matter, ie a " Whats a 747 doing at that angle of climb".Had it been a photograph of an F15, no one would have questioned the dodgy perspective and this thread would have been quite short, because we all know F15s are capable of climbing out at these sorts of angles.
Its preying on what is being shown and what ones actual experiences/perceptions are, ie 747s dont climb at that angle.
This is how all optical illusions work to a certain extent.