In Mary Elizabeth Braddon's "Aurora Floyd," the idea of self-assertion is explored as a facade that can temporarily impress those who lack insight. It suggests that individuals may create an illusion of success or importance through loud declarations and confident actions. However, this can mislead only until deeper scrutiny reveals the truth behind their bravado.

The metaphor of a drum emphasizes that while the sound may be captivating, a closer examination will show that it lacks substance. This reflection serves as a cautionary reminder that outward appearances can be misleading, and true value lies beneath the surface rather than in superficial displays.