Final answer:
The Pisa Baptistery Pulpit by Nicola Pisano illustrates the transition from the Maniera Greca to a more naturalistic and 3-dimensional style.
Step-by-step explanation:
The artwork by Nicola Pisano that illustrates the beginning of classical influence, with a focus on realistic interpretation, and demonstrates a transition from the Maniera Greca to a more naturalistic and 3-dimensional style is the Pisa Baptistery Pulpit by Nicola Pisano. This artwork showcases the shift towards a more realistic representation of figures and a greater sense of depth and dimensionality.