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We need more parameters, but assuming unlimited cost and time, the rack should be completely automated and voice operated. It should be capable of grinding those spices that need grinding. It should be capable of measuring and dispensing the spices into a receptacle that is within the user's reach. An audio indicator should exist to let the user know that the requested spice is empty and requires refilling. A refill receptacle should also exist for this case.

1. Let us assume there are n number of rows in the Rack .
2 . Also assume what could possibly be the height of the complete rack , This rack has to be placed such a way that It is not too close to Cooking Stove as well as Not too far from the reach of the Hand of the Blind person cooking
3. Blind person need not reach any additional support to reach the highest level of Rack so to search a particular spice
Then Solution
(a) the most used spices in a nth Rack , the list used in n-1 th Rack (N starts from the lowest level in the Rack to 1 )
b) To make life easier for seraching one can further divide the Size of Containers to Hold the spices .

How about a spice rack with a robotic arm. The user only has to say the name of the spice and the arm will pick up the appropriate spice jar and place it on an easily accessible space like a plate. There doesn't even need to be an arm, the spice rack could just rotate the correct spice jar into an easily reachable location.

First i we should make location of this rack identified by the blind person easily before we look at other requirements