The explanation of the symmetrical features on the west and east sides of the grand gallery in the pyramid of Khufu has always been an intricate puzzle for researchers. The existence of such peculiar features is generally related to the function of parking the granite plugs, but only three or four granite blocks were presumably used to plug the ascending corridor, while a much larger number of slots and niches are found in the gallery. Previous interpretations of niches, slots, cuttings and grooves are unsatisfactory, and the present investigation focuses on important, formerly neglected aspects. The analysis of numerical patterns in the design of the grand gallery provides crucial evidence, and a new interpretation of the features in the gallery is, therefore, proposed, by considering the numerous variables implied in the problem.