Module 9 : Passages           
  Lecture 29 : Introduction, pipe, passage in Nature
 
http://us.123rf.com/400wm/400/400/pr2is/pr2is0811/pr2is081100005/3815335-arch-shaped-passage-through-the-green-fence-framed-by-potted-plants.jpg
http://media-cache-ec2.pinterest.com/upload/60939401177639130_bTNh1Y71_b.jpg
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Plate 4A Passage 
4B Garden Passage 
4C Man-made passage

(Source: plate3A-4C)http://www.google.co.in/search?hl=en&q=pipe&bav=on.2,or.r_gc.r_pw.r_qf.&biw=
1366&bih=664&um=1&ie=UTF8&tbm=isch&source=og&sa=N&tab=wi&ei=yi1tUJjmJsvIrQej2ICIBw#um=
1&hl=en&tbm=isch&sa=1&q=passage+in+plants&oq=passage+in+plants&gs_l=img.12...814107.81581
8.17.818219.7.7.0.0.0.2.306.1389.0j3j3j1.7.0...0.0...1c.1.xz_XoAFLWm4&pbx=1&bav=on.2,or.r_gc.r_pw
.r_qf.&fp=346d726c61c72844&biw=1366&bih=664 ; Oct. 4, 2012)

Garden Landscapingapplies the concept of passage in nature (plates 4A & 4B) to create the formation of negative space. Man-made structures (plate 4C) have utilized the concept of passage for various reasons.