Omphalis is named for the Greek word for a navel: the centre of a thing.

It is where the things you choose to keep get cleaned up, given a shape, and connected to each other.

There are five places, and only five.

Today, Inbox, Library, Connections, and Settings.

A Space is a separate world of reading, with its own Inbox and its own Library.

This one is called Home.

A Collection is a grouping you choose.

An item sits in one at a time.

A tag is a label instead, and one piece can carry several of them.

A Trail is neither.

It is an inquiry that keeps growing as new pieces arrive.

Inside a long piece, Strata is its shape: the moments it moves through, each one typed and named.

The dotted underlines are annotations, and they are sparing on purpose: only where the wording can carry one.

Keep one and it becomes a mark.

Every piece has a marks rail, and it splits them: yours, and the system's.

They gather across the whole Library on one page: highlights you made, and annotations you kept from your reading.

Connections is what your pieces have in common.

A Bridge is one that reaches from this Space into another.

And anything that costs is priced in comprehension units, a monthly allowance the product shows you before it spends any of it.

That is the whole vocabulary.

Everything after this is one of them, working.