How does Oscar Wilde use imagery in The Importance of Being Earnest?

Imagery:

I hear her hair has turned quite gold from grief.

You have filled my tea with lumps of sugar, and though I asked most distinctly for bread and butter, you have given me cake. I am known for the gentleness of my disposition and the extraordinary sweetness of my nature, but I warn you, Miss Cardew, you may go too far.