I remember when I was writing 'The Tin Drum,' I had the totally misguided idea of giving Oskar Matzerath a sister, and he just wouldn't have it. There was no space for a sister, yet I had the character of the sister in my head. In fact I used her in later novels, in 'Cat and Mouse' and 'Dog Years,' Tulla Pokriski.
— Gunter Grass