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”
Too true