Answer:
Mixing blue and purple will make a blue - violet color.
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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.
Sudden enlightenment is the answer in this question. This statement used as a metaphor to express the sudden enlightenment, the Zen priest-painters used a painting technique which they called haboku a splashed ink. In short the thing they called haboku used as a metaphor to express sudden enlightenment.