Hand (unit) divided by four, then the remainder is added after the radix point. Thus, a horse that measures 60 inches is 15 hands high (15 x 4 = 60) and a horse halfway between 15 and 16 hands is 15.2 hands, or 62 inches tall (15 x 4 + 2 = 62) Because the subdivision of a hand is a base 4 system, a horse 64 inches high is 16.0 hands high, not 15.4. A designation of "15.5 hands" is not halfway between 15 and 16 hands, but rather reads 15 hands and five inches, an impossibility in a base 4
How to Fly a Horse similarly observed, "Creation isn't magic. Though the subtitle of "How to Fly a Horse" promises a 'secret history' of creation, the secret is, essentially, that there is no secret. Creativity is the result of hard work, learning the foundations and getting better at problem-solving. That's bad news for those hoping a bump on the head will lead to the design for the flux capacitor that transforms the DeLorean into a time machine. It's good news, however, for everyone else, since it means that creativity is accessible to anyone." The book was also praised by Amanda Erickson of "The Washington Post",