A counter-balancing factor, e.g., a fascinating right elbow to offset a caricature of a face. In his children's book (133) Gilbert adds this footnote: "I fancy that she meant by this that Nanki-Poo was so short-sighted as not to perceive that her moral and social qualities were an adequate compensation for the drawbacks of advanced age and damaged personal appearance. But when people lapse into poetry you never can be sure what they mean." Anyone who aspires to publish a G&S lexicon will particularly appreciate that last sentence.

Oh blind, that seest no equipoise
Act I