Family Time

We had an odd childhood; our parents insisted we use tables as chairs and chairs as tables for some reason. 

Solemnisation

How our distant future selves will pay homage to all this glorious irrationality of ours!

Custom

When an order came in at the Ladder factory a workman would ascend a rickety old wooden ladder and retrieve a shiny new aluminium one. 
No one found this in anyway ridiculous or curious. 

Relativism

The inmates of one wing of an insane asylum only consider those in the other wings mad.