When I come to the northern hemisphere (I'm in Boston) I realise how much I navigate instinctively by light and shade back home (Australia).
It comes from years of designing gardens where you're always thinking about north / south / east / west because of the impact it has on living spaces and plant performance.
Here of course everything is reversed: the light is always towards the SOUTH and the lichen grows on the NORTH side of the trees.
The end result is I keep turning the opposite way that I should.
My wife, who doesn't navigate by the sun, has no problem at all and doesn't believe my theory. She reckons I just don't have any sense of direction.
It's just the wrong direction :)