object/spring/15 matches the site

public static HumanMadeObject Spring_Simple_Historical_Ownership()
{
    var spring = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/spring/15")
        .WithLabel("Jeanne (Spring) by Manet");


    var proustAcquisition = new Acquisition()
        .WithLabel("Ownership of Spring to Proust");
    proustAcquisition.TimeSpan = new LinkedArtTimeSpan
    {
        BeginOfTheBegin = new LinkedArtDate(1881, 1, 1),
        EndOfTheEnd = new LinkedArtDate(1883, 12, 31).LastSecondOfDay()
    };
    proustAcquisition.TransferredTitleFrom = [
        new Person()
            .WithId("https://linked.art/example/person/manet")
            .WithLabel("Manet")
    ];
    proustAcquisition.TransferredTitleTo = [
        new Person()
            .WithId("https://linked.art/example/person/proust")
            .WithLabel("Proust")
    ];
    proustAcquisition.PartOf = [
        new Activity()
            .WithId("https://linked.art/example/event/manet_proust")
            .WithLabel("Full Provenance Activity")
    ];

    var payneAcquisition = new Acquisition()
        .WithLabel("Ownership of Spring to Payne");
    payneAcquisition.TimeSpan = new LinkedArtTimeSpan
    {
        BeginOfTheBegin = new LinkedArtDate(1909, 1, 1),
        EndOfTheEnd = new LinkedArtDate(1909, 12, 31).LastSecondOfDay()
    };
    payneAcquisition.TransferredTitleFrom = [
        new Person()
            .WithId("https://linked.art/example/person/durand")
            .WithLabel("Durand-Ruel Gallery")
    ];
    payneAcquisition.TransferredTitleTo = [
        new Person()
            .WithId("https://linked.art/example/person/payne")
            .WithLabel("Oliver Payne")
    ];
    payneAcquisition.PartOf = [
        new Activity()
            .WithId("https://linked.art/example/event/durand_payne")
            .WithLabel("Full Provenance Activity")
    ];

    spring.ChangedOwnershipThrough = [
        proustAcquisition,
        payneAcquisition
    ];

    return spring;
}

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/spring/15",
    Label = "Jeanne (Spring) by Manet",
    ChangedOwnershipThrough =
    [
        new Acquisition
        {
            Label = "Ownership of Spring to Proust",
            TimeSpan = new LinkedArtTimeSpan
            {
                BeginOfTheBegin = new LinkedArtDate(1881, 1, 1),
                EndOfTheEnd = new LinkedArtDate(1883, 12, 31, 23, 59, 59),
            },
            TransferredTitleFrom =
            [
                new Person
                {
                    Id = "https://linked.art/example/person/manet",
                    Label = "Manet",
                },
            ],
            TransferredTitleTo =
            [
                new Person
                {
                    Id = "https://linked.art/example/person/proust",
                    Label = "Proust",
                },
            ],
            PartOf =
            [
                new Activity
                {
                    Id = "https://linked.art/example/event/manet_proust",
                    Label = "Full Provenance Activity",
                },
            ],
        },
        new Acquisition
        {
            Label = "Ownership of Spring to Payne",
            TimeSpan = new LinkedArtTimeSpan
            {
                BeginOfTheBegin = new LinkedArtDate(1909, 1, 1),
                EndOfTheEnd = new LinkedArtDate(1909, 12, 31, 23, 59, 59),
            },
            TransferredTitleFrom =
            [
                new Person
                {
                    Id = "https://linked.art/example/person/durand",
                    Label = "Durand-Ruel Gallery",
                },
            ],
            TransferredTitleTo =
            [
                new Person
                {
                    Id = "https://linked.art/example/person/payne",
                    Label = "Oliver Payne",
                },
            ],
            PartOf =
            [
                new Activity
                {
                    Id = "https://linked.art/example/event/durand_payne",
                    Label = "Full Provenance Activity",
                },
            ],
        },
    ],
};

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.