Entering from the 9th St side, you'll find the smaller of the two play structures straight ahead. A double slide, curved climbing ladder, tunnel, small bridge, steering wheels and a shorter single side are all attractions here. There is also an even smaller structure behind this for the playground newbies to try out their first climbing and sliding experiences on these mini versions.
To the right of the smaller structure is a set of baby swings, tucked behind a fence on the north perimeter of the playground.
I have to say Harmony is actually one of my favorite playgrounds... it has great equipment, it's in the park, it's convenient to Park Slope... and I just like the feel of it for whatever reason. I often prefer quieter, less busy locations but this is one exception. If I'm willing to brave the nearly always present school groups hogging up the place it must be something slightly great. A+