manipulation : noun
1. the act of manipulating.
2. skillful or artful management.
device : noun
1. an invention or contrivance, especially a mechanical or electrical one.
2. a plan or scheme for effecting a purpose.
3. a crafty scheme; trick.
4. a particular word pattern, figure of speech, combination of word sounds, etc., used in a literary work to evoke a desired effect or arouse a desired reaction in the reader: rhetorical devices.
5. something elaborately or fancifully designed.