The Pink Notebook
I see it quite often in Japan.
A notebook, a glove, an umbrella, a hat, scarf, and many other lost items that would otherwise be stolen or left on the ground, are placed up on something.
For example this little pink notebook and pen.
This was just balancing perfectly on this railing. and I had to get a photo.
I assume the person who forgot it, will come back tracing their steps and come across their notebook.
The person who placed it here is an angel.