Talk:Cutie marks/@comment-27606149-20160118192749/@comment-31491129-20170721025059

I think it's because the three objects refer to the ponies they care mostly about. For example, AJ has her grandmother, big brother, and her little sister. Then Rarity has her mom, dad, and Sweetie Belle. The list continues on. This theory was explained by TheBronyNotion. You can find him on youtube.