Poem

    class Word
    {
        public Word Reference { get; private set; }
        public string Title { get; private set; }
        public Word(string title, params Word[] properties)
        {
            this.Title = title;
            foreach (var i in properties) {
                Properties.Add(i);
            }
        }

        public Word(Word reference)
        {
            Reference = reference;
            Title = reference.Title;
        }

        public List<Word> Properties = new List<Word>();

        public override string ToString()
        {
            return Title;
        }
    }

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Word Moon = new Word("Moon");
Word Sky = new Word("Sky");

Moon.Properties.Add(new Word("Place", Sky));

Moon.Properties.Add(
    new Word("Walk",
        new Word("Walk",
            new Word("Slow"), new Word("Think",
                new Word("Inside",
                    new Word("Deep"))))));



Moon.Properties.Add(
    new Word("Watch",
        new Word("Watch",
            new Word("We",
                new Word("Place",
                    new Word("Ground")),
                new Word("Sin",
                    new Word("Many"))))));

Word Stars = new Word("Place", Sky);