Re: Aikido Weapons
I could maybe accept that the spear is one-dimensional, having never seen its use in aikido (I don't think as used in the ko-ryu it could be called one-dimensional). But I don't see how the jo is any more three-dimensional than the sword. Any argument for the sword as used in aikiken being two dimensional could equally well be applied to the jo; any argument for the jo being three-dimensional could equally well be applied to the sword.
(for an example, see the kumitachi...ki musubi no tachi, say)