In some stories, the value of a universal constant is different than it is reality. For example, in Going Postal:
'Something like that, sir, probably, something like that,' said Groat. 'Three and a bit, that's the ticket. Only Bloody Stupid Johnson said that was untidy, so he designed a wheel where the pie was exactly three. And that's it, in there.'
What is the first story to feature this concept?
A universal constant here can be either physical (Planck's constant, the speed of light), or mathematical (pi, the Golden Ratio). What's important is that the story feature a situation or universe in which the universal constant is, well, not