I'd say it's worse than that, a rubber ruler still has a definite length when not under tension etc.
This might be more like asking amateur painters to each paint a picture of a different one of the pumpkins, then judging each other's paintings without seeing the actual pumpkin that painting was based on.
This might be more like asking amateur painters to each paint a picture of a different one of the pumpkins, then judging each other's paintings without seeing the actual pumpkin that painting was based on.