This was a small deck with a 4 season addition. The unique things about the deck are that it is a composite material with a heringbone design and that it has a fully lit set of spiral stairs. This project turned out great. This was a small deck with a 4 season addition. The unique things about the deck are that it is a composite material with a heringbone design and that it has a fully lit set of spiral stairs. This project turned out great.