Duchamp truly wants to show the importance of and satisfaction he gains through motion. in this case, it is quite evident that motion is to be achieved through the movement of the bicycle wheel because it is mounted on top of a stationary object. the wheel lacks a seat and is upside down for a reason--that reason ironically being, motion! the artwork itself most definetly lends itself to our first characteristic of modernism. we should not be concerned with what we are percieving the wheel to physically be, rather we should just "see" what is "taking place" in the artwork--that would be motion! secondly, minimalism plays a key role in this work. Duchamp reduced movement completely down to a single object; the bare essential needed to convey the message was utilized. and finally, Duchamp definetely uses an unconventional way of portraying the importance of motion. he chooses to voluntarily juxtapose motion and the absence of motion by wheel and stool respectively. what better way to show than showing objects we are all quite familiar with. i do not think we would gain the same message if Duchamp used a painting or photograph to convey his message. that fact that we can "SEE" the wheel gives us an even stronger sense of movement than if we just "LOOKED" at a 2D representation.