Cornelia Konrads is a German artist who creates stunning works of natural art that seemingly defy gravity, emphasizing the temporal nature of things.  You can visit her website here

Gravity-Defying Land Art by Cornelia Konrads [updated]

German artist Cornelia Konrads creates mind-bending site-specific installations in public spaces, sculpture parks and private gardens around the world. Her work is frequently punctuated by the illusion of weightlessness, where stacked objects like logs, fences, and doorways appear to be suspended in