Wine Unloading Tempo

Two men were unloading boxes of wine bottles from a truck. One man was inside the truck, picking them and loading them onto a raised wheel-ramp where the boxes would slide down to the end of the truck. The second man picked them up and stacked them onto a trolley before they were carried into the store.

The pair worked in synchronized rhythm and the boxes were unloaded efficiently. First man placed box onto the ramp, box slide downward, second man caught it, turned around and stacked it up. It was done in a fast coordinated tempo.
There was this one box, while the trolley was full, second man was busy securing the boxes; the first man did not notice and continued putting it on the ramp. The box slide down, to the end of the truck and straight to the ground. Box cracked and bottles shattered.

This is what happens when tempo is off. If the first man is the lower body and second man is the upper body, or the first man is the torso and the second man is the hands, when one is done faster or slower than the other, bottles shatter.

Both men can work in fast or slow pace, it is the synchronization that matters to a smooth tempo.