These photos demonstrate motion and stillness. 

An object's purpose is fairly easily seen even when it's not being used. A chair is obviously for sitting in, a door for opening, the desk for holding items in easy reach while sitting. It's all pretty basic stuff to us, but think of all the years of experience it took us as children to learn those functions? "Don't climb on the desk, don't slam the door, don't stand on the chair" all these things we tried many times, all the while being told by other people how not to use them.

However when we see an object in motion, we have only one mental outcome: Is it being used correctly for its intended purpose? A wheel in motion shows you the object, and its purpose. It transfers linear motion into rotational motion to conserve momentum.

Things in motion appear differently than they would in a passive state. These buckets for example list to  one side, if they were truly hanging they would be completely vertical. So they must be in motion, swinging from side to side, appearing differently in motion than when still.

Until next time.