It can create an instant outdoor room over a patio or deck ...
also you can throw up a cover on top cheaply, such as greenhouse
screening to filter out the hot sun rays, but still allowing the air to
come through. We temporarily took ours down one summer to install
a new roof on the house, it was awful without it. Not only was it hot,
and even though we have a private backyard -- it felt so 'open.'
Big fan of pergolas here Have our pergola over our deck
since the early 1970's ... it still going strong.