Yes, that's NYC covered in darkness. And that little red heart is you. And that number below (1.381%) is the percent of NYC you have discovered... Myself and Mani created this app prototype called Streetheart. For those claiming they have "seen everything" or "know everything" about NYC, we provided a humbling metric at the bottom revealing the percent of NYC they have explored (just reaching 20% would be a massive achievement). And yes, in the true spirit of NYC, it only works when you are walking.