What project establish leonardo's reputation ans a creative and talented engineer

Answer the important painting of the baptism of the christ, leonardo painted the kneeling angel and some of the background for this;

I’d say platform as a service (paas) or application platform as a service (apaas) or platform base service is a category of cloud computing services that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with developing and launching an app.