For every action there is an equal and opposite reaction, noted Sir Isaac Newton.

Behold: the Anti-Café has come to Brooklyn, borough of the $12 cup of coffee.

The concept, which hails from Russia and is popular across Europe, charges by the hour for unlimited coffee and snacks.

For $6 for the first hour, customers at Williamsburg’s Glasshour can feast on coffee and snacks like granola bars. It’s 10 cents a minute after that up to $24 — and from that point, everything is on the house.

“It’s about communication over consumption,” said Max Grigoryev, who funds trader-oriented dot-com startups and founded the cafe with three pals. “People are here all day. It’s a comfortable place to work, we have high-speed WiFi, and people also come to sit and play games for hours.”

The 1,000-square-foot space at 63 Skillman Ave. seats 20 and can also be rented out for events.