Which only serves to prove my point. Truth is not absolute in all, or even most, conceptual or practically applicable circumstances.
The method of putting the two boards lies in truth.
nailing them together = Yes
Glueing them = Yes
Nailing and glueing = Yes
Dove tail = Yes
Pins/dowels = Yes
Using rubber bands = No
Your point is that you choose to believe that truth is only relative to your belief. When infact people believed the earth was once flat, which is not true. therefore what people believe doesn't constitute truth.