The Light, at first, experimented with hiding behind the Darkness, and then tried hiding in front of the Darkness.
Having nothing in particular to hide from, and a sullen Darkness as it's only audience, things were going just about as well as could be expected.
The Light, not one to be daunted too easily, decided to go about doing something about the sogginess. This, however, required a mop, which, of course, wasn't too handy, the Darkness and Light being the only two things in existence at the time. So the Light attempted to move the sogginess around without the use of a mop, and found it quite a rough go. However, finally, there was some sort of order, if it only be some bit of sogginess on one side and another bit of it on the other side. The middle remained a bit soggy, as well, but marginally less so than before. Or so the Light told itself, anyway, in order to make it seem worthwhile to be staying around and feeling like it had some purpose, in any case.
It was feeling slightly annoyed with whomever had left the place all wet. It wasn't the proper state in which a place should be left. Not at all. The Light had a good mind to complain, if there was anyone around to complain to, besides the Darkness, who wasn't quite listening, anyway. The Darkness remained sullen, grumbling once in a while about the good old days, when it had the place all to itself.
The next morning, upon awakening, the Light found a light green fungus growing on the drier spots in the middle that it had been tending to the other day with some limited degree of success. A bit frustrating, no doubt. You take the time to tidy something up, get some semblance of order together, and are just ready to put your feet up, and either it's the kids or the dog getting in the way and tracking dirt all over the place or you've got a mould growing on the floor. It's the sort of thing to drive someone away, it is, and it almost happened, almost making everything that followed a whole lot darker than it turned out.
Luckily, later that morning all the commotion by this rather small planet that seemed to be having a problem with mould caught the attentions of a couple of other rocks floating about in the Darkness, who were quite impressed by the trick with the mould. These two, for sake of convenience, we shall call the Sun and the Moon.
"Seem to have a bit of a problem with your planet, there." The Sun nodded silently, and what apparently was supposed to appear sagely, in agreement with the Moon.
"Ah, no, no problem."
"Really? Seems there's something growing on it." The Sun again nodded.
"Hmm? Oh no, no, not really." The Light poked around the globe a bit, turned it a few times on its axis, and held up a side with not so much mould to the Moon.
"But what about that lot?" The Moon pointed out the mould which had been partially obscured by the Light's thumb.
"Ehm, oh, that's not mould."
"I never said it was mould."
"Well, it's not, you know."
"Really? What is it, then?"
"Ehm, why, I'm not sure, what's that doing there?"
Both the Sun and the Moon looked at one another, then back at the little globe.
"It looks a lot like mould to me. Shame about that, huh?"
"Ehm, no, no, I meant that. I did that on purpose. I just was trying to ehm... you know, I didn't know that was what you were referring to, I thought you'd seen something else, some kind of nasty fungus growing on it. No, I wanted something like this. Isn't it nice? I think the green goes well with the... eh, you know, the eh, soggy bits."
disclaimer:
"Can you promise me," I replied, "that if anyone offered you these intense pleasures you'd remember the vortices and me, and not shut yourself away from us?"
-Msr. Bernard le Bovier de Fontanelle, trans. H.A. Hargreaves, Conversations on the Plurality of Worlds