No time to read all the comments, but it made me laugh out loud (chuckle out loud at least) because even the great artists DID sometimes have assistants and when doing a process that required paint to be mixed with egg as it was there, some sort of code may have been used (on the sketch -not the actual surface) but it may have been the equivalent of the first “paint by numbers” and I think that is brilliant!
No time to read all the comments, but it made me laugh out loud (chuckle out loud at least) because even the great artists DID sometimes have assistants and when doing a process that required paint to be mixed with egg as it was there, some sort of code may have been used (on the sketch -not the actual surface) but it may have been the equivalent of the first “paint by numbers” and I think that is brilliant!