What does the pair of happy and sad masks symbolized​

The masks depict the happy and sad emotions that drinking wine can bring. They have also been linked to the Greek God Janus which is known as the two-faced god of beginnings. It is said Janus lent the name to the masks.

Theatre

Explanation:

Happy/sad paired masks are referred to as the comedy/tragedy masks or as Greek theater masks. They represent the theater and refer to the range of emotions presented by stage actors. For many decades, the image of the theater masks have, universally, become like a symbol of theater or acting

the sculpture i am pretty sure you are talking about is the statue b. the david statue now lives in the galleria dell'accademia, florence, italy. it was made by ‎michelangelo.