Originally published by Doubleday in hardcover in 1965. Copyright date 1964 From the back cover: IT WAS ALWAYS SATURDAY You woke each morning with the comfortable feeling that you didn't have to go to your job. Instead, you could climb into your brand new Jaguar, pick up your girl and go to the beach. Except that when you looked into your shaving mirror you saw a note tacked up, written in your own hand: THIS IS AN ILLUSION. MAKE GOOD USE OF YOUR TIME, BUDDY BOY. Because the illusion wouldn't last. And soon you would be back as an unwilling colonist on the dreary planet Mars.