just guessing but like a pyramid so then u can step up the side. after a while tho wouldnt they brake appart from stepping on it?
naw, straw bales are pretty firm, I wouldnt worry about them falling apart unless you take the wire off that holds it together.
I believe the difference between hay and straw is that straw is the remains of harvested crops such as beans and corn stalks, and is mostly used for bedding. Hay is usually made from grass, and primarily used for feed.