Mesa Livre, Free Table, is a nice intervention conceived by two young advertising guys from Porto Alegre in Brazil. Ramon Ballverdú and Caio Turbiani came up with this idea during lunchtime where they saw that many chairs were unoccupied. While there was a line of people waiting for a free table.
The solution is a simple sign with which they transform occupied tables in free seats. The result is not only extra income for business owners, it is also a change to connect people who eat lunch alone.