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Idle thoughts: we can consider a dynamic piece to be 'relative positional' if its move is determined by its position relative to other pieces. Mimes would be a subset. An 'absolute positional' dynamic piece would then be one with a move determined by its coordinates without regard to other pieces: the zelig would fall in this category. Imitators are 'relative temporal' (determined by time after an event). An 'absolute temporal' piece would then be one that has a move determined by how many plies have passed since the start of the game. The pieces of Flip Chess/Shogi are neither, since the player chooses the change. Discretional?