Hey Catchup,
We manipulate the world everytime we step outside our front doors. It's unavoidable ...every interaction we have, whether explicit or tacit, has some effect.
Here's a social experiment you could try. Simply smile/nod at complete strangers : ) Just the simple act of passing recognition can make someone feel less lost, less invisible, less alone in the world.
... and the best part is, they haven't made it illegal yet : )