I have no fear of dying in space, none! In contrast, the thought of drowning terrifies me as does that of falling from a great height.
> "Vertigo is something other than the fear of falling; it is the desire to fall -- against which, terrified, we defend ourselves."
That's from memory (over 20 years ago) but I think I got it right.
Your eyes tell you it's flat so you can step forward...but your sense of balance tell's you something different..brain is confused, you never have that feeling when your IN the wall.