To get the pattern in english you will find it here

This pattern is inspired by the square in central Stockholm called Sergels Torg.

“Sergels torg (in English: Sergel’s Square) is the most central public square in Stockholm, Sweden, named after 18th century sculptor Johan Tobias Sergel, whose workshop was once located north of the square.
…
Sergels torg has a dominant west-to-east axis and is divided into three distinct parts:

1. A sunken pedestrian plaza furnished with a triangular pattern (colloquially referred to as Plattan, “The Slab”) and a wide flight of stairs leading up to the pedestrian street Drottninggatan, connecting south to Stockholm Old Town and north to Kungsgatan.
2. This plaza is partly overbuilt by a roundabout centred on a glass obelisk and by the concrete decks of three major streets.
3. North of this traffic junction is a considerably smaller open space overlooked by the high-rise façade of the fifth Hötorget Building from where the avenue Sveavägen extends north.”

From Wikipedia

You need one ball of each color.