With the introduction of the original Staunton Chessmen, which were first registered by Nathaniel Cook and produced by Jaques of London in 1849, it become an accepted standard that the Knight should be taller than the Rook.
With the exception of the Rook, the height of the individual Chessmen is an accurate reflection of its relative value. The King, the most valuable piece on the chess board is also the tallest. Likewise the Queen, the second most valuable piece on the Chess board is the second tallest. The minor pieces, the Bishop and the Knight, are widely considered to be roughly equal in value and are approximately the same height, with theBishop being slightly taller in deference to its superior mobility. The Pawn, the least valuable is also the shortest. The House of Staunton asks 'Why is the Rook, one of the major pieces and one of the most valuable(5) significantly shorter than both the less valuable Bishop and Knight?'
With the introduction of the Renegade Luxury Series Chessmen, we have thrown out standard convention and have returned the Rook to its rightful stature, towering over both the Bishop and Knight.