What does Bashfull mean?
I'm reading Discworld novel of 'Raising Steam' by Terry Pratchett and am confused by the following paragraph:
As they hurried inside Bashfull said, ‘Please let me, as they say, mark your card, Mister Lipwig. The King is furious. Furious with the rebels and furious with himself for not doing enough at the right time and I dare say he’s also furious with me. But me, well, Ilook to the sky and I say to Tak, “Don’t get mad, but when you made us dwarfs you had a bad day and couldn’t find anything in the subtlety box.” It seems that we’d sooner fight and argue than live.’
The sentence Bashfull said to Tak, the creator god of dwarfs, seems like Greek to me.
What is a subtlety box? What meaning is Bushfull trying to convey?