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I believe that with the new salt and pepper shakers, the salt shaker is the one with 3 holes, while the pepper goes in the one with 2 holes. Salt is used more than pepper anyway. Pepper should only ever be fresh ground at the table, meaning salt shakers win out.
Designed by architect Michael Graves in 1990, the salt shaker mill is part of a group of products designed in the 80's and 90's by the architect. This was the first group of products by an American designer to be included in the Alessi catalog.