Sometimes referred to as Leading Lines, I talk about this compositional technique in my Beginners Guide to Landscape Photography, which you can get FREE if you subscribe to my newletter.
In the 52 Assignments book by Ross Hoddinott & Mark Bauer they say - "Our eyes are designed to locate and follow lines, whether they be natural or artificial, leading us instinctively to explore the scene in an image." This is absolutely true and you can see an example of this in the below image.
The rocks on the right of the foreground create a line leading into the image toward the horizon. The rocks behind those also form a line leading toward the sunset and the lines of the sunset also add another way to draw the eye.
The lines in the two images below are a bit more obvious. In both of these I have used the lines of the bridge to lead the viewers eyes toward the main subject of St Pauls Cathedral.
A few tips:
Getting close with an ultra-wideangle lens will exaggerate, stretch and emphasize the zise of lines.
Placing your lead-in lines so that they enter from one of the bottom corners of the frame can prove very effective.
Lines don't have to be straight to encourage the eye into the image. Vertical, diagonal, zigzagged, curved or S shaped lines can be just as effective.
Lead-in lines work best when they lead into the distance toward a point of interest such as a building, tree or person, or the sun setting on the horizon.
I'm enjoying this book and the assignments in it and can highly reccommend it. 52 Assignments - Landscape Photography by Ross Hoddinott & Mark Bauer