Fragmentation
The scene is assembled from multiple fragments. The most popular are the square-shaped ones. There are also rectangular, circular, and triangular fragments, but they're less popular. So, every square piece has 2 fastenings, which are inserted into grooves. To assemble you just need a hex tool. Holes to insert the legs are at the bottom. For aesthetics, the legs can be hidden by a skirt. Simple and easy.