Ship in full sail

I went beach combing along beyond Morrison's Haven, lots of pretty sea glass and a couple of stones. I cycled. 

There is a new tarmac path between Mussleburgh and Port Seaton, getting lots of use by both cyclists and pedestrians, lots of dogs too. 

The weather was lovely. 

On my way back I saw a big lump of broken glass on the path so I picked it up to bin it, and then saw the fine etching of a ship in full sail. Only to look again and realise that the marks are random scratchings in a black coating. 

Funny what the eye sees.