- The option is there for people who have vision problems. Apparently it helps in some cases to have a negative image. Apple included it to comply with Universal Access standards laid down by one of the disability advocacy groups (can't remember who exactly).
- The Scratch And Sniff Committee (SASC) Directs-And-Monitors All Primate Experiments in Scratching (DAM APES). We are also responsible for Sniffing A Lotta Small Animals (SALSA).
The DAM APES were established shortly after the last ice age. It was not long before they learnt to incorporate SALSA into their activities.
As some members of the organisation developed larger brains and opposable thumbs, they broke off their own faction, called Hitting Uther Monkeys Around the Noggin (HUMAN). The HUMANs went on to develop the wheel, fire and polka music, while the DAM APES decided to stay in the forest and just scratch and sniff each other.
It was pointed out that since they were going to hang around in the trees and scratch and sniff things, they might as well do it in an organised way. So, they planned to establish the General Assembly for Scrathing and Sniffing (GASS). But when the DAM APES attempted to pass GASS, they were repealed. Hence, the Scratch & Sniff Committee was formed.
There, does that explain everything? ;-)