Herma de Wit-Orobio de Castro's artistic works encompass bronze sculptures, objects, drawings, etchings and monotypes, which serve as striking reflections of her profound connection with nature.​
The artist fearlessly challenges artistic boundaries. In both her monotypes and bronze sculptures, strength and fragility are played off against each other.

The vulnerable thin Japanese paper is in perfect balance with the fragments of fossil flora, imprinted onto the paper with considerable compressive force.
The bronze sculptures incorporate fitted pieces of fossilized flora, wherein the unyielding, rock-hard bronze serves as a bearer for these delicate fossils, maintaining a flawless equilibrium in the tension they evoke.