Bicycles always make for easy photographs, don’t they?!
True, Peter.
Also, there’s more than the bicycle that has contributed to the crafting of this image. There’s that circular depression, at the right, in the brick wall, that supports those similarly shaped nuts on the retaining clamp around the shaft the seat attaches to. Next, there’s the rolled edge of the seat reflected in the rounded edge of the brickwork that the bike rests on. Then, theres the lines of mortar between the bricks that are reflected in the three splayed metallic lines located down below the seat. Theres a lot of ‘bits’ talking to each other in this image.
Prosophos 
There’s that excellent geometry again, Peter …
Bicycles always make for easy photographs, don’t they?!
True, Peter.
Also, there’s more than the bicycle that has contributed to the crafting of this image. There’s that circular depression, at the right, in the brick wall, that supports those similarly shaped nuts on the retaining clamp around the shaft the seat attaches to. Next, there’s the rolled edge of the seat reflected in the rounded edge of the brickwork that the bike rests on. Then, theres the lines of mortar between the bricks that are reflected in the three splayed metallic lines located down below the seat. Theres a lot of ‘bits’ talking to each other in this image.
Thank you Sean…