https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigaBwurVayN4q2MroxU2_Dy5c69Mw6UNMGSqPJ-pfV2GoIeps11kHrbjbIYA5WRlQXkCl52uRl4F4cKSkoIQSOMn8_I2_CS6L2XDs0Cy4HHO24DRpyEZvFFtUnog-y4ygxrBTeuEGeaPA/s1600-h/place_gambetta_apr_05.gif
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh07WN3uUsajRTY_v1h71A938kffcNqReRYq-LrAyP98qImeUVTo6ty7Ty9ieBZSnH_Kt-qyIZDjyruYlHicXQrnuuvRcfnc63j7PsiRU9XVkgHP07gjO0XAGbp1zyugjMS3pR4rju2GGg/s1600-h/img_assign.gif
There are three types of lines, horizontal, vertical and diagonal, each one has a different impact among your picture. Lines are a very powerful element in the photography world, it takes a lot of practice to get the precise pattern of lines. So when an image is based on the concept of lines it is focusing on the lines within the picture, eg vertical horizontal and diagonal.