The Eye of Horus was believed to have healing and protective power, and it was used as a protective amulet. It was also used as a notation of measurement, particularly for measuring the ingredients in medicines and pigments. The symbol was divided into six parts, representing the shattering of Horus´ eye into six pieces. Each piece was associated with one of the six senses and a specific fraction.
More complex fractions were created by adding the symbols together. It is interesting to note that if the pieces are added together the total is 63/64 not 1. Some suggest that the remaining 1/64 represents the magic used by Thoth to restore the eye, while others consider that the missing piece represented the fact that perfection was not possible. However, it is equally likely that they appreciated the simplicity of the system which allowed them to deal with common fractions quickly, after all they already had a symbol for the number “1” and they had other numerical notations available when they needed to use smaller fractions. [x]