In reply to nniff:
> Top to bottom, because if you miss one tie in loop it will be the bottom one, which is not a disaster, whereas the other way round might be.
> Gates face the same way so that it's easy to make sure the gate faces the way you want it to, and a peg clipped in a corner will need the gates both facing the same way.
And if you forget to finish tying your knott? Certainly a bigger diaster that inverting (which I have done once). I agree on gates face same way.