Climate Change and Water Colours

Interesting idea to collect digitalised water colours as a means to track change.  It does, of course, depend on the original accuracy of the artist.  There are plenty of reasons why images might look different to what the artist saw.

Such reasons might include simple fashionability (as is said to have been the cases with images of the Dodo); altered perspectives for artistic effect (as Canaletto often practised); use of art as a marketing tool (as with John White's pictures of early America); cultural bias (as with insertion of items that "should" be there) e.g. Russia should be cold and full of snow.  I wonder how the project will deal with all of those?