A method is disclosed. The method includes providing a first movable assembly that is movable between a first location and a second location of a structure, providing a second movable assembly that is movable between a third location and a fourth location of the structure, and disposing a first growth material in the first movable assembly and a second growth material in the second movable assembly. The method also includes illuminating the first growth material from a first position at the first location at a first time and from a second position at the second location at a second time, and illuminating the second growth material from a third position at the third location at the first time and from a fourth position at the fourth location at the second time.
