Everyone Is Floating

Idioms elude me. Idioms, as in the basic rules of speech and conduct in human society. I never know how to smile.

Details fly away like birds. Roots turn into clouds, but fail to precipitate: If there is no gravity, the atmosphere evaporates. If g=0, then cantbreath/e <>

I am thinking of the impossible scenario, in which people and houses, flora and fauna, soil and lakes, start floating upward, with much serenity as violence, into the sky. But if I am floating, too, then I will never know that the whole world was also floating.

I am a bad passenger, questioning the integrity of my own vehicle.