Find a place to sit in the wilderness or if you cannot reach the wilderness just find any place to sit.
Step 2: 2# Think about the amount of chair we already have.
You'll notice that most household do not need chairs... If something they need to rid them selfs of some to optimize the usage of space. Designing new chairs will not help us to solve issues with the lack of space because we'll need to store the old chairs somewhere. Where will the old chairs go? You might already know that in some cultures people do not even use chairs.
Step 3: 3# Think about the time you spend designing new chairs.
Now if you are a designer you possibly have sat at a lecture about the "history of chairs" or something like this and even participated on workshops on how to make chairs. The time you spend designing new chairs has been rewarding but the time could have been spend doing something else... What was wrong with the chair you sat on when participating on these lectures?
Step 4: 4# Realize that we already have enough chairs
"There is nothing wrong with the chair I am sitting on now", "I can see a lot of empty chairs around me", "There are enough chairs for everyone" you realize. Say it out loud. Realizing the amount of chairs we have renders the desire to design new vain. Do not feel guilty about the chairs you have design.. Start thinking how to maintain them. If you meet a friend who does not have a chair to sit on. You could help her/him find one. That's more then enough to provide chairs for everyone in the world.
Step 5: 5# Why not repair broken chairs to suit your need?
He have a plentitude of decent chairs it the world. Most of them serve our need to sit already but to maintain this ideal it would be smart to start repairing the ones we have.