I am drawn to the abstract pattern that a lens can create when the the whole subject can not be in focus resulting in some areas of the image blurred.
Much can be said about bokeh and it's rather impossible to be fully quantified or describe it but most purist cherish the "smooth" out-of-focus backgrounds.
I, on the contrary, prefer to find lenses that offer "texture" in the blurred areas of my images.
refitted projector lens 35-KP 1,8/120 1/640sec
I do understand that such traits in these lenses are not so well suited for subjects where the attention should remain in the in-focus areas but a lot of my photographs are often of close-up and semi-abstract subjects where a "busy" bokeh might be the crucial component of an image
adapted Pentacon 50mm f1.8 1/1600sec
Initially my visual adventures were concentrated on "bubbles" in the bokeh; now I am pursuing the textured, busy and "weird" bokeh.
Some lenses are specifically sought after for those incredible traits and unfortunately my favorite looks are out of my price range (like the Dallmeyer Super-Six 102mm f1.9 lens)
Slowly I am starting to understand which subjects, what patterns and what light will be a suitable theme for my experiments. Repetition of small objects and lines, combined with the correct subject/background ration and lens will reveal surreal images.
And it's a look that the mighty iPhone has not conquered yet :-)
adapted Kodak Cine 63mm f2.7 1/50sec
refitted Helios-89 30mm f1.9 (from FED Mikron) 1/4000sec
refitted Russian projector lens 35KP-1,8/120 1/800sec