Asus S1 - Manual (Page 36)

36 LED projector E-Manual
Aspect Ratio
Select this menu option to adjust the screen ratio of your projection
onscreen.
You may change the projection of your display according to the
following aspect ratios: AUTO, 4:3, and 16:9.
Projection Position
This option allows you to change the way your projections are
oriented onscreen based from the current location of your LED
projector.
You may change your projection’s orientation to correspond with
the location where your LED projector is currently placed: FRONT
TABLE, REAR CEILING, FRONT CEILING, REAR TABLE.