You can *observe* an object in motion by looking at it. Your eyes can detect changes in position over time, which is the essence of motion.

However, you can't *measure* motion accurately just by looking. To measure motion, you need:

* A reference point: You need to know where the object is relative to something else.

* A way to measure distance and time: You need to be able to determine how far the object travels and how long it takes to travel that distance.

Here are some ways to measure motion that involve more than just looking:

* Using a ruler or measuring tape: You can measure the distance the object travels.

* Using a stopwatch or clock: You can measure the time it takes for the object to travel a certain distance.

* Using video recording: You can record the motion and analyze the footage to calculate the object's speed, direction, and acceleration.

In short, you can observe motion by looking, but you need more than just your eyes to accurately measure it.