What type of floral arrangement is characterized by being twice as long as it is high?

The described floral arrangement, characterized by being twice as long as it is high, aligns with the horizontal arrangement style. This type of arrangement emphasizes length and often showcases floral elements laid out horizontally to create a sense of width. Horizontal arrangements typically convey a feeling of tranquility and stability, making them visually appealing for table centerpieces or low displays.

In contrast, the vertical arrangement focuses on height, featuring tall lines and structures that draw the eyes upward, making it unsuitable for a length-to-height ratio of 2:1. Diagonal arrangements incorporate slanted positioning that adds dynamism and movement but does not conform to the specified dimensions. Asymmetrical arrangements prioritize balance without adhering to strict ratios, meaning they may not necessarily be twice as long as they are high. Therefore, the correct identification of the arrangement type based on those dimensions is indeed the horizontal arrangement.