...they look like knees which have been added using photoshop.
No offence to you, Lee, but does anyone else find that people (esp non-photographers) will use the 'photoshopped' comment on any image that is slightly abstract or non-conventional? I use PS myself an awful lot and know that I and many others will mostly strive to make their images as 'natural' as possible - unless its a deliberate attempt to be off-the-wall.