What philosophies or philosophers made attempts to unify noumena and phenomena as indistinct from each other, that is to show that they are all mere pattern representations* in a "mindspace"**? The result of which would be/is a type of blindness or indifference in a way similar to how our organs work without us being specifically aware of how.
*loosely speaking, I am calling a pattern representation a given set of relationships that becomes(?) apparent from objects in the physical world/those experienced through our senses and those in our minds. Maybe a simplified example is how a stock-market profile reflects the profile of a mountain range; as in the self-similar patterns one sees in fractals. Or how gravitational attraction and attraction between beings are simply one facet(s) of the same pattern representation. In abstract space there may be no difference between the "structural controls" of each; the differences we choose to see may simply be in the combination of patterns.
**loosely speaking mindspace is the all-encompassing, multi-dimensional (including the physical world) space that we reside in, having infinite(?) or at least high multi-dimensional power. Pattern representations are noticeable in this mindspace.