Brooklyn Public Library Central: An Afternoon Where the Building Opens Like a Book at Grand Army Plaza, Brooklyn

Around three in the afternoon, the sun clears the trees at Grand Army Plaza and lays itself flat against the Central Library's facade, and for a little while the whole Art Deco front — built to open like a book, two great pages of limestone swinging back from a gilded spine of an entrance — seems to be reading its own light. I have stood there longer than any errand justified. The Brooklyn Public Library made a small ripple of news this June with a limited-edition JAY-Z library card, and it's a fine excuse to come; but the durable story, the one that will still be true when the special editions are gone, is the building itself and the free room inside it.

This afternoon is for readers, writers, the newly arrived, the temporarily broke, and anyone who suspects the best things in a city might still cost nothing. It is not for the itinerary-tickers — you cannot photograph the doors, nod, and call it done, or rather you can, but you'll have missed the entire point, which is on the other side of them.

Quiet, but not the fragile kind — a working quiet, thousands of separate concentrations laid side by side. Long tables, tall rooms, the soft percussion of pages and rolling carts. Nobody asks what you're there to buy, because there is nothing to buy. The third week is when a place starts talking, I like to say, but a library is generous: it starts talking within the hour, if you sit still enough to hear it.

Get a card — they are free, and that sentence deserves its own line more than most. If timing favors you, ask at the desk about the JAY-Z limited edition; special editions come and go, so check at the desk or on bklynlibrary.org rather than taking this page's word for it. Then do the real thing: pull a book you'd never buy, find a chair near a window, and spend two hours the way afternoons were originally intended. Wander the stacks when your attention loosens. Repeat.

Weekday afternoons, when the rooms are at their calmest and the light does its slow work across the tables. Check the day's hours on bklynlibrary.org before you set out — they vary by day, and a locked door is a poor ending to a slow plan. In summer, the plaza outside holds the evening warmth long after the reading rooms close.

The 2 or 3 train to Grand Army Plaza leaves you nearly at the doors; the B or Q to Seventh Avenue is a short walk along the park's edge. Prospect Park begins across the plaza, and the Brooklyn Museum and Botanic Garden sit a few minutes down Eastern Parkway — though I'd argue against stacking them all in one day. Slow is a lens. One free room, properly attended, outweighs three hurried ones.

Stay long enough for the light to repeat and you learn this building's schedule: mid-afternoon for the gilded entrance, when the sun hits the figures above the doors and the whole spine glows; late afternoon inside, when the window light goes long and honest across the tables and the readers stop noticing it, which is when they're worth photographing — with permission, always, and never with flash. Photograph the ordinary; it's the rarest thing. A man asleep on an open atlas is worth more than the facade, and the facade is worth a great deal.

• Entry is free; no ticket, no reservation.

• Library cards are free — eligibility rules apply, so ask at the desk or check bklynlibrary.org.

• The JAY-Z limited-edition card may or may not still be available; availability changes, confirm on the day.

• Hours vary by day; check bklynlibrary.org before you go.

• Quiet rooms mean quiet phones.

Brooklyn Public Library, Central Library, Grand Army Plaza, Prospect Heights, Brooklyn, Art Deco, free things to do, library card, JAY-Z library card, reading room, slow travel, Prospect Park, Eastern Parkway, quiet afternoon

Ask Karpo first whether the special-edition cards are still at the desk — then stay for the room either way, because I did, and the light was just beginning to move across the third table from the window when—