Horse 2718 - This Is "Not A Bin"

This weekend after I'd successfully ended up on the wrong road and going to the wrong place, we went to Windsor and pottered about for bit.
While walking along a path by the riverbank, I encountered this:

As my brain is a repository of the useless, the nonsensical and the daft, immediately my mind went to that 1929 painting in oil on canvas by René Magritte entitled 'The Treachery of Images' and which is more commonly know as 'This is Not a Pipe' in English.

This is not a pipe.

This is not a painting of a pipe.

In this context, it is the electronic representation of a photograph of a painting of a pipe with the caption "Ceci n'est pas une pipe"; which is French for "This is not a pipe" underneath it.

The painting is I assume a commentary on the concept of a meta-message; parading the thought that the representation of a thing is not actually the thing.

While I don't really want to get into the meta-argument of what this representation of a photograph is, I am prepared to question the message on the real object itself. This is a real bin in the world and it is very clearly a bin; standing in a specific holder for bins.

Why then does this carry the message that it is 'not a bin'?

I do not think that this is a piece making an ontological query about the the nature of being a bin. Granted that the nature of reality could very well be pure subjective fantasy and that space and time and here and now are only in our mind but somehow I do not think that a bin in Windsor would be making such an enquiry.
Nor do I think that this is an art installation because that is very obviously a holder for bins and this is very obviously a bin.

If anything, this could be a question to do with the teleology of the bin. Just like Aristotle would claim that the telos of an acorn is to become an oak tree, that is the purpose of the acorn is to become a thing that makes more acorns (and conversely an oak tree's purpose is to grow and then make more oak trees), the usual teleology of the bin would be to be a bin; that is, a receptacle of people's rubbish. If a bin's purpose isn't to be a receptacle of people's rubbish, then what is it for? The claim made here is that it is 'not a bin'; which implies that the bin has some other purpose, however we are not told what that purpose is.

As much as I would personally to go back in time and point at Ludwig Von Mises for being a cruel prat, I fear that his explanation of praxeology might be useful here. His 1949 work 'Human Action' lays out the case that economics is essentially a praxeological science (however murky and dark that it is) and that people's reasoning and purpose defines the economic decisions that they take. I would argue that humans are irrational and cruel and downright selfish, and that Von Mises must have been deliberately fridge blind to not offer the six years of unpleasantness which happened just a little bit before this, as evidence.
Someone has assigned some purpose to this bin (its telos) due their reasoning (their praxeos) but we the passers by haven't been told what it is. Maybe if I can put some cake into Schrödinger's Box with the cat, then I have it and eat it as well. Or it could very well be that the cake is a lie and this is actually some kind of reverse psychology, trying to get the general public to defy the notice and put their rubbish in there.

I do know that as someone with incomplete information, I am merely confused by this bin which claims that it is 'not a bin'. If it is not a bin, then what is it? What other purpose has been assigned to it, and if that other purpose exists, then why is it in a holder for a bin?