object/spring/5 matches the site

public static HumanMadeObject Spring_5_Description()
{
    var spring = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/spring/5")
        .WithLabel("Jeanne (Spring) by Manet");


    spring.ReferredToBy = [
        new LinguisticObject()
            .WithClassifiedAs(Aat.Description, Aat.Statement)
            .WithContent("A chic young woman in a day dress with floral accents holds a parasol against a background of exuberant foliage.")
    ];

    spring.Shows = [
        new VisualItem()
            .WithId("https://linked.art/example/visual/spring")
            .WithLabel("Visual Content of Spring")
    ];

    return spring;
}

• 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.

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/spring/5",
    Label = "Jeanne (Spring) by Manet",
    Shows =
    [
        new VisualItem
        {
            Id = "https://linked.art/example/visual/spring",
            Label = "Visual Content of Spring",
        },
    ],
    ReferredToBy =
    [
        new LinguisticObject
        {
            Content = "A chic young woman in a day dress with floral accents holds a parasol against a background of exuberant foliage.",
            ClassifiedAs =
            [
                new Type("http://vocab.getty.edu/aat/300435416", "Description")
                {
                    ClassifiedAs = [Aat.Statement],
                },
            ],
        },
    ],
};

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.