Union Flag
The striking red, white and blue design of the Union Flag today harks back to a time when “Britannia ruled the waves”.While the flag appears symmetrical, the white lines above and below the diagonal red are different widths. On the side closest to the flagpole (or on the left when depicted on paper), the white lines above the diagonals are wider; on the side furthest from the flagpole (or on the right when depicted on paper), the converse is true. Thus, rotating the flag 180 degrees will have no change but, if mirrored, the flag will be upside-down.
Placing the flag upside down is considered an offence against the dignity of the reigning sovereign.(U.S. Air Force photo by A1C Lausanne Morgan)