Japan, ranked 16th in the world and hindered by a gene pool that delivers athletes with speed and skill but little bulk, are the metaphorical walnut.
New Zealand, ranked No1 in the world and blessed with a diverse mix of athletes, are the metaphorical sledgehammer.
On Saturday, this sledgehammer will smash into the walnut with entirely predictable results. The walnut will be obliterated and the whole trip has an element of futility.
The original objective of this week in Tokyo was to grow more leaders and provide game time for the emerging All Blacks.
The presence of Daniel Carter and Richie McCaw has shrouded that a little, but the likes of Beauden Barrett, Dane Coles and Ben Smith will have extra responsibilities in terms of guiding those around them.