A while ago Laume suggested looking out for different kinds of line. I have been doing just that when out on walks. Here are a few I have found... The stark lines and dots of the plane tree contrasted with the chalky line of the aeroplane trail.
The tangled lines of the scaffolding.
The solid feel to the trunks of this line of trees compared to the soft and indistinct appearance of the upper branches.
The powerful and dramatic shape of a pollarded plane.
The geometric feel of the lamp posts as they march off down the street.
Go and visit Laume for some beautiful photos of tiny worlds on raindrops.