Fours are about growth & expansion from stability. Fours through Earth are creating the foundation, the ability for the idea to grow & advance.
A man adds the fourth disc to three others which rest in order on a square platform (with four legs). The platform is beside a straight path. The world is otherwise empty. These indicate the clarity of his purpose.
The yellow sky indicates the background of possible ideas. This is reflected in his yellow shirt as the one idea he is moving forward with. Red hair and blue pants remind that all four elements need to be in balance to allow expansion. These are his foundation.
Physical growth & advancement. Stability & security. A good foundation. Time to advance with a project. Work will be easy. Material gain.