Rubaʿi is a poetic form of four lines of ten syllables
It is rhymed aaba. 
Also known as the Omar Khayyam quatrain or Rubaiyat Stanza.

I am posting two examples here: One quatrain from the famous "Rubáiyát of Omar Khayyám" This is #43 from a translation by  Edward Fitzgerald in 1872. and the one below it is my own "response" in Rubai --smile-- 

"Rubáiyát of Omar Khayyám" - Quatrain #43

So when the Angel of the darker Drink
At last shot! find you by the river-brink,
And, offering his Cup, invite your Soul
Forth to your Lips to quaff -- you shall not shrink.


Four Lines of Norm’s Twisted Wisdom:

"Cogito Ergo Sum in Rubai" (with apologies to René Descartes)

"So when the Angel of the darker Drink," *
the Tingsha bells enchant me to the brink
of losing all my rationality;
my ears do ring…I am therefore I think.

* from “Rubaiyat of Omar Khayyam” translated by Fitzgerald Verse XLIII

© Norman S. Pollack