Final answer:
The secondary line in Ikebana, the Japanese art of flower arrangement, is called the soe, which helps create structure and form along with the main stem (shin) and tertiary line (hikae).
Step-by-step explanation:
The secondary line in Ikebana arrangements is called the そえ, pronounced 'soe'. Ikebana is the Japanese art of flower arrangement that not only emphasizes the beauty found in nature but also the harmony and balance of the overall composition.
In Ikebana, different stems or branches take on distinct roles, the main stem being known as the しん (shin), the secondary line as soe, and the tertiary line known as ひかえ (hikae).
These elements together create the structure and form of the arrangement, allowing each part to complement the other and contribute to the aesthetic of simplicity and minimalism characteristic of this art form.