(Source: http://www.google.co.in/search?hl=en&biw=1341&bih=581&q=Sailboat&bav=on.2,or.r_gc.r
_pw.r_qf.&um=1&ie=UTF8&tbm=isch&source=og&sa=N&tab=wi&ei=8LNIUKbtFYf5rQfo5oDoCQ#um=
1&hl=en&tbm=isch&sa=1&q=Ancient+tents&oq=Ancient+tents&gs_l=img.12...221494.231077.4.232
736.15.14.0.0.0.0.0.0..0.0...0.0...1c.1.KqNBeeuCpY8&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=749c3f8
cbb1106ba&biw=1341&bih=581 ; Sept. 6, 2012)

The tensile structure is covered by a skin that may trap wind, stop rain and protect from external environment. We have seen earlier that among animals and birds there are large numbers of species which have tensile structure for various purposes. Use of tent build with the help of tensile structure is known to human civilization for thousands of year. Tents are built during war, travel (plate 33A), Safari Tents inside the forest (plate 33B), luxury purpose (plate 33C), tracking and camping purposes (plate 33B), etc. It protects from outside environment and provides resting place with some degree of privacy. Living in tent has always been exciting and relaxing to human beings that bring man closer to nature.

34A Modern Aircraft	34B Early Plane	34C Early Tensile wings	34D Lobster

(Source: 34A http://www.google.co.in/search?hl=en&biw=1341&bih=581&q=Sailboat&bav=on.2,or.r_gc
.r_pw.r_qf.&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=8LNIUKbtFYf5rQfo5oDoCQ#um
=1&hl=en&tbm=isch&sa=1&q=Aircraft&oq=Aircraft&gs_l=img.12...217456.221257.8.223796.8.8.0.0.0.0
.0.0..0.0...0.0...1c.1.cH3c3JvsLn4&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=749c3f8cbb1106ba&biw=134
1&bih=581 ; Sept. 6, 2012
34B&C http://www.google.co.in/search?hl=en&biw=1341&bih=581&q=Sailboat&bav=on.2,or.r_gc.r_pw.r
_qf.&um=1&ie=UTF8&tbm=isch&source=og&sa=N&tab=wi&ei=8LNIUKbtFYf5rQfo5oDoCQ#um=1&hl=e
n&tbm=isch&sa=1&q=Early+aircraft&oq=Early+aircraft&gs_l=img.12...86.13813.2.15992.15.15.0.0.0.0.
0.0..0.0...0.0...1c.1.UglWyDOIu0Q&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=749c3f8cbb1106ba&biw=13
41&bih=581 ; Sept. 6, 2012