Hint: Round things
The answer to this puzzle is:
1. EYEBALL
2. BUTTON
3. PEARL
4. GLOBE
5. ORANGE
6. TIRE
7. BALL
8. PLATE
9. DRUM
10. BAGEL
11. HALO
12. TORTILLA
13. DISH
2. BUTTON
3. PEARL
4. GLOBE
5. ORANGE
6. TIRE
7. BALL
8. PLATE
9. DRUM
10. BAGEL
11. HALO
12. TORTILLA
13. DISH