Guerilla Hopscotch
It all started with an innocent Slack post from Paul Novaks (@novakps -- blame credit where credit is due): "This should be at 770 Chapel", linking to a video of hopscotch on a city sidwalk. A little bit of chatter with @BenBerkowitz and the ball started rolling.
And now we have a (mostly) short-term pair of hopscotch boards chalked on the sidewalk in front of the building.