It might turn out that for some purposes, those that involve making use of the world and manipulating it for our benefit, we need, in fact, to be quite selective about what we see. In other words we might need to know what is of use to us – but this might be very different from understanding in a broader sense, and certainly might require filtering out some aspects of experience.
Grouping things accordong tp usefulness fpr action, threat to continued action and that which serves as neither currently.
