Christmas tree (oil well)

src: www.sjpec.com In petroleum and natural gas extraction, a Christmas tree , or "tree", is an assembly of valves, spools, and fi...

Chinese garden

src: upload.wikimedia.org The Chinese garden is a landscape garden style which has evolved over three thousand years. It includes both the ...

Acorn

src: upload.wikimedia.org The acorn , or oak nut , is the nut of the oaks and their close relatives (genera Quercus and Lithocarpus , in th...

Traffic Light Tree

src: upload.wikimedia.org Traffic Light Tree is a public sculpture in London, England, created by the French sculptor Pierre Vivant followi...