object/nightwatch/70 matches the site

public static HumanMadeObject Statement_With_Creation_And_License()
{
    var nightwatch = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/nightwatch/70")
        .WithLabel("Night Watch");

    nightwatch.ReferredToBy = [
        new LinguisticObject()
            .WithClassifiedAs(Aat.Description, Aat.Statement)
            .WithClassifiedAs(Aat.Term("300456841"))
            .WithContent("Rembrandt's The Night Watch is a dynamic 17th-century group portrait of an Amsterdam militia company ...")
            .WithCreatedBy(c => c
                .WithTechnique(Aat.Term("300456842"))
                .WithTimeSpan(new LinkedArtTimeSpan
                {
                    BeginOfTheBegin = new LinkedArtDate(2024, 11, 7, 20, 50, 0),
                    EndOfTheEnd = new LinkedArtDate(2024, 11, 7, 20, 50, 0)
                }))
            .WithSubjectTo(
                new Right()
                    .WithClassifiedAs("https://creativecommons.org/licenses/by/4.0/", "CC-BY")
                    .WithName("CC-BY 4.0"))
    ];

    return nightwatch;
}

• Metatype classification The second argument classifies the first, not the object: WithClassifiedAs(Aat.Description, Aat.Statement) says this is a Description, and Description is a kind of Statement. The Plain C# form shows the nesting.
• Configured in place A lambda configures the nested object as it is created, so a name, an identifier or a production is built where it is attached instead of in a separate variable.
• Terms outside the registry The vocabulary registry holds only the terms linked.art itself publishes, so a dataset's own concepts, places and people are written with Aat.Term, Tgn.Place and Ulan.Person, giving the id and the label.

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/nightwatch/70",
    Label = "Night Watch",
    ReferredToBy =
    [
        new LinguisticObject
        {
            Content = "Rembrandt's The Night Watch is a dynamic 17th-century group portrait of an Amsterdam militia company ...",
            ClassifiedAs =
            [
                new Type("http://vocab.getty.edu/aat/300435416", "Description")
                {
                    ClassifiedAs = [Aat.Statement],
                },
                new Type("http://vocab.getty.edu/aat/300456841", null),
            ],
            CreatedBy = new Creation
            {
                TimeSpan = new LinkedArtTimeSpan
                {
                    BeginOfTheBegin = new LinkedArtDate(2024, 11, 7, 20, 50, 0),
                    EndOfTheEnd = new LinkedArtDate(2024, 11, 7, 20, 50, 0),
                },
                Technique = [new Type("http://vocab.getty.edu/aat/300456842", null)],
            },
            SubjectTo =
            [
                new Right
                {
                    ClassifiedAs = [new Type("https://creativecommons.org/licenses/by/4.0/", "CC-BY")],
                    IdentifiedBy = [new Name("CC-BY 4.0")],
                },
            ],
        },
    ],
};

Generated from the object the example builds: every property that is set, as object initialisers, with the vocabulary constants where a term is in the registry. The fluent helpers are a convenience, not a requirement; this form and the one as written produce the same JSON.