First : exercising for a quarter of an hour in my garden with left over stones from paving the court yard. The wind decided it wasn't a good one, after half an hour it fell over, that was that.
A few hours later the stoneman was build at the friends' house, and wonder ... it worked well, in a few minutes it was up. no picture here, it is a private 'monument' All the different shapes and sizes and colours fit perfectly.
So today I picked up the stones from my exercise and decided to put them in a different way and surprise, it took me two minutes to build. And hey ... a few hours later it is still standing. My first - tiny - stoneman.
It is not building the stoneman that takes time, it is finding the right stones to build one.