One of my starting points for designing a binding for Ontto harmaa by Olli-Pekka Tennilä(of which I bound another copy last year) was that I wanted to avoid using the colour grey. The name can be translated as "hollow grey", and as I didn't want the book design to illustrate what exact kind of shade of grey the book was talking about - it felt the definition should be left up in the air. But in the end I couldn't find a more fitting colour linen for the covers (really, really loved the yellow leather I used the first time around, tho) and decided to go with the grey that simply looked the best out of all the options. I haven't regretted the choice: the typewritten binary code looks perfect on it - just the right contrast, texture, variety.
The numbers 1 and 0 are a recurring element in Ontto harmaa, so the idea of using binary code in the design was the one that I built on right from the start. But since Ontto harmaa is a book full of warmth too, the use of a natural material with an organic feel on the covers balanced things off beautifully.