Products that have low cognitive overhead: - Original iPod - Fender Stratocaster - Roland TB-303 - Casio F91W - Unix (Ok, it's not a simple product, but "e

Products that have low cognitive overhead: - Original iPod - Fender Stratocaster - Roland TB-303 - Casio F91W - Unix (Ok, it's not a simple product, but "everything is a file" goes a long way.)