How about, "My eyes saw it, but my brain didn't."
That is exactly what the link that I posted in post#7 is demonstrating. You look at the rotating shape with all of the dots moving around. The ones that stay still disappear. They are not there. In fact, they are there, but they are not moving - so your brain ignores them. Move your head slightly and they 're-appear'.
But this doesn't explain the people who just don't look in the first place. Thankfully, they are very easy to spot. They will be the ones in a car.
As for the moving wheel technique - it is a technique that is advocated in the Police rider's handbook - Roadcraft. But that info is a tad too late for me. I look at their faces and eyes - that gives me a better clue about what they are about to do before they have even done it. It's something that I use to great effect on a pushbike. You know when someone is looking directly at you. When they see that you are looking at their eyes, you stop being this little bike that can be ignored, You become a 'threat' to them and they take much more notice - not least because they have seen that you are so much bigger than them, but also because they know that you have seen who they are, and what they are about to do is being closely observed.
There is a built in 'guilty' reflex. You do something a little silly, and there's a police car. First thing you do is scratch the side of your face. Subconsciously hiding your face. Police are trained to look for that. Noticing that you are being looked at is the biggest deterrent to rash moves that I have found. It is very easy to get this effect on a pushbike, but it works very well on a motorbike too. Lift your visor to improve the effect.
Spot the early warning signs.
Its a car
The driver has pulled up after the white line.
He looked left first (UK) / He looked right first
I cannot see his eyes - so he hasn't seen me.
S/he's a young driver.
S/he's an old driver.
S/he's riding the clutch / hasn't fully stopped.
There's a gap in the traffic coming the other way.
They have been looking in the other direction for a long time - waiting for that gap to emerge. They checked in your direction and they think its clear. If you haven't yet seen their eyes as you get closer, that is the time to beep the horn.