- #sprite(9).visibility=1-sprite(9).visibility|Haringvlietdam# (1971)
- #sprite(5).visibility=1-sprite(5).visibility|Stormvloedkering# Oosterschelde (1986)
- #sprite(2).visibility=1-sprite(2).visibility|Oesterdam# (1986)
- #sprite(10).visibility=1-sprite(10).visibility|Maeslantkering# (1997)