soil and coconut roll

My third device is installed in places surrounded by houses. 

Workers from local authorities at the request of the residents install a sheet of fabric made of coconut.

 They also bring soil…

After that residents grow vegetables in it .

Here the containing in public and the content is private.

Thus, my devices are aimed at the population with 3 levels:
directly with inhabitants 
by the association of the neighbourhood, 
by the intervention of local authorities.

It depends on the complexity of the project.