The Dyckerhoff Bridge

Almost like the outline of an eye.

It looks very curvy here which is in contrast to this picture of it.  That makes it look very flat and it really isn't at all.

I've been suffering from a very odd visual problem. 

It starts off with a c-shaped disturbance in my vision.  The shape is filled with what looks like dancing, multi-coloured triangles.  It starts quite small and then it grows until it's the only thing I can see.  I can't focus on anything when it happens - I can't read anything for a start.  It goes after about 30 minutes or so. 

This has the rather pretty name of "Scintillating scotoma".  It seems to be becoming more of a regular occurrence which is a pain.