What’s a manifesto? What does it have to do with 21st century design?
All designers have a tacit or explicit “manifesto” of design values/ideas/axioms that, sometimes loosely, sometimes closely, help guide and direct their work. Having such principles can help designers keep their own voice; help them resist external pressures to cater to commercial or technical trends, and give their work a more critical edge. Often it gives designers confidence to be bolder in their work.