All pages are private by default.

You can make a page public by marking it with a special tag.

Within public pages you can additionally mark certain blocks as private.

Block references and embeds on public pages would be resolved and included as public parts of the garden.

For any private page that was referenced in the public page an orphan page would be created. Such a page would collect backlinks to a private page from the public pages without revealing the content of the private page.