[corin_]

Doesn't the fact that you need to point at them rather somewhat suggest that owning "ornaments" with the phrase isn't useful other than for the sake of art? Buyers of this poster likely won't have their own pg around to point at it and remind them to pay attention to the meaning :)

[pg]

No: (a) the t-shirts probably also work without me pointing to them, and (b) me noticing that the shirt has the answer is an instance of the phenomenon I describe.

[corin_]

a) Fair enough b) Do you really need that, or does it just feel nice to see it? If they weren't wearing the t-shirt would you really not think of it? If I put up a poster in my kitchen saying "Eat!" then I would often notice it when it's completely relevant, but that doesn't mean it's a useful poster.