If it's there and you can see it - it's real. If it's not there and you can see it - it's virtual. If it's there and you can't see it - it's transparent. If it's not there and you can't see it - you erased it!
Give a man a fish, he eats for a day. Teach a man to fish, he eats for a lifetime. Give a man a fire, he's warm for a day. Set a man on fire, he's warm for the rest of his life.
Macs are for those who don't want to know why their computer works. Linux is for those who want to know why their computer works. DOS is for those who want to know why their computer doesn't work. Windows is for those who don't want to know why their computer doesn't work.