The handcrafted Haüy books all came in uncomfortable sizes and weights for children. They were laboriously constructed, very fragile, and expensive to obtain: when Haüy's school first opened, it had a total of three books. Nonetheless, Haüy promoted their use with zeal. To him, the books presented a system which would be readily approved by educators and indeed they seemed – to the sighted – to offer the best achievable results. Braille and his schoolmates, however, could detect all too well the books' crushing limitations. Nonetheless, Haüy's efforts still provided a breakthrough achievement – the recognition of the sense of touch as a workable strategy for sightless reading. The Haüy system's main drawback was that it was "talking to the fingers with the language of the eye".