CLEAN: Rembrandt, Raphael works lead Old Masters auction

The video discusses Raffle's fresco, focusing on the preparatory cartoon used for the painting. It highlights the rediscovery of a Rembrandt painting, unseen for 40 years, now available for study and viewing. The video also mentions an upcoming notable event at Christie's, emphasizing its significance in the art calendar.

What role does the cartoon play in the creation of the fresco?

What event is described as one of the most notable in Christie's calendar?