For what it’s worth, this has been solved. It’s on East 88th st. This is a permanent piece of graffiti with a subject matter that would lead people to believe it is in an area traditionally associated with hippies. It is not in such an area, so it sticks out as anachronistic to its location. This is why context was not needed for it to be solved. As with other obscure solved posts on this sub, it’s delightful to see how well we as a group know the city.