How many times have you sat through a play or an evening of short plays to find yourself in the dark pretending not to notice the inept scene changing happening onstage?
Good directors know that one of the most enthralling things about theatre is being in the presence of transformation.
Really good directors make something of even the most mechanical of these opportunities - the scene change.
Here some commercial makers use the effect to, well, great effect.
And now for a personal plea: Please make scene changes interesting for us. We can see you in the dark. We really can.