Without a reference object, viewers have no reliable idea how large something is.

The coin shows that the object is relatively compact.

This helps rule out some possibilities and supports others.

It also demonstrates how visual identification works in practice.

Size is not enough to identify an object, but it can provide important context.

Other useful reference methods include:

A ruler.

A measuring tape.

A known object such as a bottle cap.

A photograph from multiple angles.

A close-up of surface details.

Pictures showing exactly where the object was found.

Those details can sometimes be more useful than a single dramatic photograph.

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The Location Could Be More Important Than the Object

If someone wanted to identify this object more confidently, one of the most useful pieces of information would be its exact discovery location.

Was it loose on the cargo-pit floor?

Was it attached to a surface?

Was it inside a container?