Taurus the bull. The solid quality is not necessarily in the material sense, but describes someone or something that is able to continue at length with a project without easily quitting.
Solidity is persistence.
By the medieval era the element of earth was ascribed to Taurus. Earth is cool and dry which describes the placid nature these natives are said too have. In relation to the sign of Aries, which has to do with expression and awareness, Taurus is about the awareness of other things outside the self for the first time, introducing the idea of object permanence, and as a result, is a producer of wealth. The Moon also has alot to do with fortune. The ancients say that Taurus has these qualities because it has adopted Venus as its house steward.