These beautiful marks have been made by some unkown (at least to me) process.
The two browny-beige ones are from the side of an old boat. Has a snail left a trail in the dirt ? – I just don’t know. The greeny white image is taken in a large orangery, the panes were white washed to keep out the glare of the sun. Who or what has made the tiny squiggles I do not know, but they were very so very fine and thin. Amazing nature once again.
John Muir said “In every walk with nature one receives far more than one seeks”