I started opening arch and design in the texture editor and changing the textures of each object. The cylinder is a pearl finish, the box is a matte finish and the sphere and floor are glossy finishes.
I then changed the box to a glossy wood finish, but only wanted to render the change so I changed the setting in the render box to region, so it only rendered within the box I created.
So you can see the reflection on the other objects and it makes render time quicker for tests. I then added a glass finish and a metal finish just to test them.
I then changed the sphere to a copper finish and the reflections are really cool and realistic. You can even see the box within the spheres shine.
I then changed the box to a glass finish and the tutorial continues with other ways to mess around with the settings and finishes, to get the best effect.