Most of the houses in New Orleans have spray-painted crosses on them. It gives the city the eerie feeling of a plague, as if Albert Camus were alive and well in New Orleans. These were used to indicate if the military had gone through the home. A brief description...

The left area indicates the unit that went through the home.
The top area indicates the date that the military went through the home.
The right area indicates what services may be still on, such as gas, water and electric.
The bottom area indicates how many bodies were found in the house.