What is the medium of a work of art ?

It's the type of art, for example oil or watercolor painting, drawing, woodworking, and graphic arts are all mediums.

Answertheatre had an unsavory reputation london authorities refused to allow plays within the city, so theatres opened across the thames in southwark, outside the authority of the city administration

Iwould say asking questions. even over the small things because then you can get an answer that should you to understand more.