7:1-9—These aren’t visions in the mystical sense- Amos literally sees locusts, fires, a plumb line used in construction, and, because he is intimately familiar with Scripture, these sights in everyday life become visual aids in helping him understand God’s plans for Israel.
8:1-3—Summer fruit would signify the end of the growing season- it would also have been highly perishable, so a basket of summer fruit won’t last long before it rots. It would’ve been eaten quickly.
9:1-6 – God’s power is established and the fact that it is impossible to hide from his will.