LOL - you got me!

I don't see how else to put my non-professional interest in without seriously jeopardizing the spirit of the failure and theory essay.
One of the reasons I am so hell-bent on writing about my non-professional interest is simply because I think it differentiates me significantly and I bring something to the community..that I want the school to be aware of.
I will wait for the formal announcement of Columbia essays but if it is just the 3 essays, I will most certainly write the optional essay..I guess I am willing to take a small risk by using the optional essay for a "different" purpose, but more importantly I want to make sure that the adcom is fully aware of what I bring.
EDITED - I now actually WANT it to be just the 3 essays! One of the benefits might be that the passion essay was just 250 words, which was not enough for me - atleast the optional essay gives me 500 words