It is wonderful to have the legacy of these great masters of pictorial art. And to observe it up close. To be in front of such a work is breathtaking. Thank you for including the Bosch (El Bosco, in spanish) link. I studied his work in college in Art Appreciation.
He is a great reference in painting.
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It is great indeed. Many of them are really large in size and then to think they are centuries old and we can still just stand and look. Pretty amazing!