Used optically clear printed graphic film with designed hash patttern to recreate squash glass that usually has burnt-in coloured ceramic dots. The inner side of the hash film is printed in black while the second layer is a blue colour. Spectators do not see the black hash lines from the outside allowing them to have optimum view of the matches. The blue colours on the inner side of the court causes an optical illusion, which makes it impossible for the player to see the spectators outside the court.