Not until you read the text panel beside her works do you realize that Rush references the Fibonacci sequence in which each number is the sum of the two preceding it.
Fa babuisi ba tsaya mafoko a a mo meleng e mebedi e tsia, o tla lemoga gore mo moleng wa botlhano, Sakoma o buela ka bonya fa mo moleng wa borataro gona a buela ka pejana.