How does Caster play with Camber

[CTX-SLPR]

I've been reading and rereading lots of threads and articles on suspension aspects and thier effects. Probably the one I have the hardest time following is how caster affects camber. While I think I can see the physical driving points behind it (i.e. how the leading bolt on the cross shaft has more shims under it causing it to cause camber gain) but how is this called caster?

Thanks,