Ludwig Wittgenstein, the father of language philosophy, postulated that language is simply a placeholder to stimulate pictures in the mind of the receiver. The problem is that on the whole it is difficult to get the words that we say to elicit the correct picture we wish to convey. This becomes even more difficult when attempting to define larger and more abstract concepts. As an example, Wittgenstein addressed the futility of producing a set definition for a concept like Art. However, he noted that Art could be defined from a particular perspective: dance, literature, sculpture, science, culinary, and so on - all of these perspectives providing shape to Art as a whole.
If we take these notions of language and communication and apply them to the process of design, two subsequent things become apparent: applying many and diverse perspectives to a design problem will result in a more considered and holistic solution, however this can only occur if the participants are capable of adequately communicating their perspective on the matter to their peers.
As such, I propose that the most important tool that an individual can possess, regardless of discipline, is that of communication. Be it through speech, gesture, drawing, or any other relevant means, the ability to successfully convey the pictures in our minds into the minds of others is the greatest feat of which we are capable.
For the purpose of this manifesto, I have taken my reasoning and simplified it to a formal exercise. The structure that I have created houses an abstracted geometric form at its centre. The slats spanning radially along the perimeter of this structure allow in diffused light, but hide the central object from view, save for four axially aligned spyholes. Four participants sit around the structure, each looking into their own spyhole. From their relative perspectives, they must then communicate by whatever means they see fit to come to a consolidated communal understanding of the three-dimensional form in the centre. Through this collaborative analysis they will have combined their respective perspectives into a fully realized form understood by all.
It only exists from every perspective.