I don't get the message of this. I mean it isn't surprising that somebody collects portraits of ex-slaves (somebody collects anything, after all), but as this g

I don't get the message of this. I mean it isn't surprising that somebody collects portraits of ex-slaves (somebody collects anything, after all), but as this gets enough attention to be posted on HN and even reach the top I assume there must be some deeper meaning which I don't see at all.