>>"I think therefore I
>>am"
>
>Even in this statement there is an assumption.

What assumption?

Descartes'
>self-image is based on whatever filter he sees through.

This is not quite the same. He is not presenting a self-image, he is challenging existence. He is in actuality fighting the perceptive filters which you have mentioned. I think therefore I am, is a clear and distinct statement. Any human being, from any race or culture, can make this statement and find it to be true. There is no filter.

We
>are all conditioned and everything we know is subjective.

I think you are straying from the discussion. This is not a conversation that is purely psychological, also, there is a level of objectivity that Descartes has proven to exist, and that is, that the world, which exists beyond the perceptive filter is composed of geometric shapes. Even if you are unaware of the formula for a triangle, you can still draw one. It is an innate idea. The laws of mathematics exist without us here to discover them, in essence mathematics may be viewed upon as a divine language. So you see, not everything we know is subjective.

Peace.