Module 11 : ‘Functional & Non-functional Elements’ in design
  Lecture 31 : Dot, Line, Conclusion
 
http://t1.gstatic.com/images?q=tbn:ANd9GcQXsPdaZ92f7ut3hrdGi3sDQgmwoquob-zha_rBAjrj-9vrCZZTog
http://t3.gstatic.com/images?q=tbn:ANd9GcTulPSzic3Zeg-lqGY-lWDHH9-fBoaB_8ZhbXwZZg0xA3pwTqDZ
http://t0.gstatic.com/images?q=tbn:ANd9GcRRecOLoGX2b0AeourKdiJBEEaewNzzjv-FMdabSbbVd7f-KddJ
Plate 5A Diagonal Line (manmade)
5B Coconut Leave Diagonal Line
5C Natural Environment
(Source: http://www.google.co.in/search?hl=en&biw=1341&bih=604&noj=1&q=line%20in%20photograph
y%20composition&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=EWs4UbuIYLLrQeZlIGICg
#imgrc=xYZ8yDToBOqITM%3A%3BGb4sB16I_mV2M%3Bhttp%253A%252F%252Fwww.examiner.com%
252Fimages%252Fblog%252Fwysiwyg%252Fimage%252FRichLegg.jpg%3Bhttp%253A%252F%252Fww
w.examiner.com%252Farticle%252Fphotography-101-rules-for-composition-leading-lines%3B320%3B400
March 7, 2013)

Manmade constructions (plane 5A) often apply diagonal lines/ planes to indicate depth of field. Similarly in nature we experience the diagonal structure for specific purpose (plate 5B). Man plan for building of road (plate 5C) using diagonal directions to negotiate through difficult terrain.

Line
Line in
visual language plays extremely important role. Space, form, line, shape, size, position, texture and color constitute the body in visual appeal. Dots, points and lines help to create the above elements. The combination of the above elements in proportion constitutes backbone of aesthetic quality.