1.   Both the fin and the rudder, the moveable panel at the back of the fin, can float, he said.

2.   He gets excited by moveable panels.

3.   Selbert has the only windowless office, but it feels light and airy because of moveable panels made from a material resembling rice paper.

4.   The rudder is the moveable flat panel in the vertical tail section that helps direct an airplane from left to right.