Simplify the following text for a Grade 6 native English-speaking person.
Original: Traditionally , the 1 ball is placed at the rack 's right corner , and the 5 ball placed at the rack 's left corner , although this is not an official rule .
Simplified: Traditionally , the 1 ball is placed at the rack 's right corner , and the 5 ball is placed at the rack 's left corner .