The rules of the game are here.
It can sometimes be difficult to see either rhyme or reason in what happens any day of the week. One sees one piece here and another piece there, but together they make no sense. Then it can often help to move the pieces around a bit, see what fits together. Maybe change your position a little. Then suddenly you see it all.
I have of course chosen a bridge as an example. If you look at "the picture in the picture", you might suspect that there is a bridge involved, but something is clearly not right. If you first move the pieces around a bit and then yourself - you might find something like what you can see at the bottom:
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PS The link above was broken, but has been fixed!
22 hours ago