What were two of Donatello's characteristic formal contributions encountered? how did he demonstrate these?

Two of Donatello's characteristic formal contributions were encountered in the work for Baptistery of Siena. He demonstrated these contributions through his use of perspective and relief. By utilizing these elements, Donatello effectively created artwork that illustrated depth and perspective. Specifically, this technique was referred to as flattened relief.

Explanation:

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The two Donatello's characteristic formal contributions are encountered in the work for Baptistery of Siena. He demonstated it through organizing the relief by a rigorous application of the rules of perspective. Even though it was created at a shallow deptht, this technique makes each figure of a scene emerge clearly and very logically. This technique is determined as a flattened relief.