The astronomical discoveries of Tycho Brahe (1546–1601), Ludwig A. Colding's (1815–1888) neglected articulation of the principle of conservation of energy, and the contributions to atomic physics of Niels Bohr (1885–1962) indicate the range of Danish scientific achievement. The fairy tales of Hans Christian Andersen (1805–1875), the philosophical essays of Søren Kierkegaard (1813–1855), the short stories of Karen Blixen (penname Isak Dinesen), (1885–1962), the plays of Ludvig Holberg (1684–1754), and the dense, aphoristic poetry of Piet Hein (1905–1996), have earned international recognition, as have the symphonies of Carl Nielsen (1865–1931). From the mid-1990s, Danish films have attracted international attention, especially those associated with Dogme 95 like those of Lars von Trier.