Integrate instruments in everyday environment.
They're not like guitars. Not intimidating like a guitar. When you hand someone a guitar, she/he says "I can't play this". But these you can play, because no one has played them before, no one can tell you how to play it.
Collaborative musical instruments could be used to strengthen the feeling of community in local areas. They can lower barriers between strangers regardless of their background.
These instruments can behave like props that, by putting people on the same level, both in terms of skills and culture, promote an alternative approach to music-making: which, at the same time, makes music and space more democratic.