The notes could be presented in various ways.

It will be a crucial thing of how they will be conducted to the spectator.

It could be a huge sheet mounted on the 7th floor of a large building, a nagging sign in a badly functioning public spot, a square where people hang out but also a humble little note pasted on top of the stairs before entering the metro-tube. All a big difference of look and potential content.

I have not been in the city of Madrid yet, so I wouldn't know what would be possible and 'asking' for a intervention. I think of Madrid as a rather big city with broad squares and large avenues.

According to this reference I am pretty much assured that there must be a potential social setting for some critical note, absurdistic statement or cheerful and positive messages.

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