Things I've always wondered about - No.1

There's a church at the West end of Princes Street in Edinburgh (St. John's or St. Cuthbert's - I'm not sure which). On the end nearest Princes St gardens there has, for a very long time, been a series of paintings. They usually show political or thought provoking issues and are all hand painted, sometimes very well, sometimes very badly.
My bus nearly always gets stuck here and I've often wondered who paints the paintings & are they done in situ, or painted then put up there.
Today I got my answer.
Now I need to find a new inane unanswerable question to ponder while my bus is stuck!