object/nightwatch/47 matches the site

public static HumanMadeObject NightWatch_Color()
{
    var nightwatch = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/nightwatch/47")
        .WithLabel("Night Watch by Rembrandt");

    nightwatch.Dimension = [
        new Dimension
        {
            Label = "brown",
            Value = 11754015,
            Unit = Aat.Rgb
        }.WithClassifiedAs(Aat.Color)
    ];

    return nightwatch;
}

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/nightwatch/47",
    Label = "Night Watch by Rembrandt",
    Dimension =
    [
        new Dimension
        {
            Label = "brown",
            Value = 11754015,
            Unit = Aat.Rgb,
            ClassifiedAs = [Aat.Color],
        },
    ],
};

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.