We have a timeline that runs a linear course through what is after all a quantum sea. Advanced waves come at us from the future, retarded waves smack us from the past. Where they meet is the present, that's what we live through. But we're not alone, of course, and what other people/things/planets do has an impact on what happens to us. What if, when something of magnitude happens on another timeline, we're riding an advanced/retarded set of ripples which create a standing wave? It'd only be there for a moment, as we are constantly travelling through time, but at times of choppiness, with lots of events happening round our timeline to potentially affect us like rainfall on a pond, there would be lots of these standing waves cropping up at once. Once in a while, some great fish might jump in the pond to smack us across the face with its tail, and we get a big significance which somehow we recognise as being big, even though we've no idea why it happened. Two events collide in our own timeline, pushed together by the impact of the standing-wave effect, and past and future merge into two events which are intrinsically connected, instantly, simply because it has to be that way. The important thing from our point of view, if this scenario is correct, is that when we get smacked with a major synchronicity something big has flopped into our ocean and we are likely to get something from it at some point in time. Like radar beacons flashing across our destiny, synchronicity is there to prove that everything is truly, genuinely connected and we have every right to trust that there's a bigger picture, and some kind of plan - whether or not there's anyone to master it being irrelevant, the significance being only that a master plan there is. Ballerina's skirts - there to be looked up.
What is loveable about all this stuff is that it might actually be true. If it is, then there's no fluffy-bunny cosiness about a belief system that's constantly open to re-interpretation. There's absolutely no constant to worry about because the universe just don't work like that. What's the point of laying constants in the face of uncertainty? UP'll just tread all over them and do exactly what it wants, which won't ever be the same as what it did before.