Do Chairs Exist?

Yes they do:

A physicist will tell me that this armchair is made of vibrations and that
it’s not really here at all. But when Samuel Johnson was asked to prove the
material existence of reality, he just went up to a big stone and kicked it. I’m
with him.

......David Attenborough
No they don't:

Like many philosophers, I don't believe that tables and chairs are
fundamental objects. Like a much smaller number of philosophers, I like to say
that I don't think tables and chairs exist. I have good reasons for my denial.
For instance, it does not appear that there is an exact moment at which a table
comes into existence.

......Alexander Pruss