Questions 1 and 2 refer to the following passage: Many gardeners find growing rare flowers or planning an elegant garden a stimulating challenge. Others enjoy topiary as an outlet for their creativity. Each shrub is a potential diamond, club, spade, or heart; each tree is a possible pyramid, cube, or sphere. The gardener with shears in hand is like a sculptor with a chisel, each bush like a block of marble.
1. From this passage, one can learn that "topiary" means
2. According to the passage, some gardeners enjoy topiary because it