This man created day and night versions of his Mountainous River Landscape on the same piece of tran
This man created day and night versions of his Mountainous River Landscape on the same piece of transparent paper. Nationalism manifested itself in a painting of a French dragoon lost in a forest, and he did multiple variations on the theme of Two Men Contemplating the Moon. He came to prominence with Frederick William III's purchase of the companion pieces The Abbey in the Oakwood and The Monk by the Sea. He showed the wreck of the HMS Griper in The Sea of Ice, while another of his paintings shows a solitary man near a rocky cliff as he looks into some mountains obscured by clouds. For 10 points, identify this German Romantic painter of Wanderer Above the Sea of Fog. 
This man created day and night versions of his Mountainous River Landscape on the same piece of transparent paper.
Caspar David {Friedrich}