1)
Why are the 10 sons of Haman written in a special way (there is one word at the beginning and end of each line, and the middle is blank)?
1.
Torah Temimah citing Megilah 16b: All Shirim in Tanach are written half-brick (the writing) on top of brick (the blank part), and brick on top of half-brick, except for Benei Haman and the kings of Eretz Yisrael, which are brick over brick and half-brick over half-brick. This is lest they rise after their fall.
