For me, thinking about sustainability, the object in the picture comes to mind. We come across it so regularly, however there is no word readily available to us to describe it (google suggests it to be termed 'cashier divider' by retail experts). Evidently, just like with 'sustainability', it is something very well known but much less engaged with.
What's more important, both the shopping divider and sustainability mark the necessity for confinement of our own consumption and draw attention to others' needs.
Maybe those two points, shallow engagement despite omnipresence and a focus on limitations of our consumption, are related. We are reluctant to make explicit the distinction between our needs and those of others, even though we are acutely aware of its necessity.
However, this is exactly where the beauty of both the 'shopping divider' and 'sustainability' could lie: in marking the confines of our needs, they enable us to direct attention to our fellow human beings. We begin to acknowledge that we are 'in this together', urgently needing to demonstrate our 'ability to sUStain'.