I met a colleague last week in downtown San Francisco and stumbled across this pocket park parked on the sidewalk. It had me thinking, what makes a park and how small can it be to still be a park? This one has the basic elements — greenery, a place to sit and watch the world go by, a splash of color, and even great design. It brightened my day and made me smile! It’s sponsored by the Yerba Buena Community Benefit District and part of the burgeoning movement to bring parks to otherwise drab urban spaces. Check out Park(ing) Day for a great example that started in San Francisco in 2005 and has now spread to 35 countries and 975 parks. So how small can a park get? This has to be a contender — but perhaps you have seen smaller ones. Let me know!