My project involves tangible user interfaces. I have developed a game in which the input will be any squeezable object. The input will have force sensors in it & the user's squeeze will be converted to electrical signal & characters in the game will move accordingly. Mode of squeeze is by placing the object between 4 fingers & palm of the hand. I am trying to place the sensors at maximum stress points in the input. Considering all these, what could be the best shapes(sphere or cylinder or anything) for the input? The user's squeeze must be efficiently translated to the game character's movement.