rectangle

I have a 10 month old ficus benghalensis as well as a 10 month old ficus religiosa. I'm trying to work on developing their radial roots and wanted to know if the shape of the pot matters (round vs rectangular vs square)? I'm assuming round is best for developing even radial roots?

Or Shelving my kiln! Got some more shelves today and did a practice stack outside of the kiln. Them new shelves kinda came with this.... Kiln sitter,(auto shut off) is broke, but seems good otherwise... Kinda hoping it DOESN'T work so I can convert it to gas! Unfortunately the elements are...