What if all words had to be four letters long?

What if all colours had to be light brown?

What if all lines had to be straight?

What if all smells had to be warm apple pie?

What if all buildings had to be perfect rectangles?

What if everyone had to speak only English?

What if the sky had to be blue?

What if all people had to be young?

What if all punctuation had to be periods?

What if everyone had to smile … all of the time?

What if all posts had to be exactly ten sentences?