Sometimes the Riccia will achieve this look naturally. When tied on the driftwood, they grow at different rates and a terrace look could materialise.
Another way is to use round flat river stones and use a netting to secure the Riccia over it. Then place the rocks in a sloping manner. Should get the terrace look as well.
I once had a pretty even driftwood and I tied moss over it. It gave a bit of terrace took.
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