If you're feeling blue today, you won't be the only one - as the landmark Library of Birmingham will be lit up with blue lights as part of a global awareness campaign for autism.
The city centre library will go blue from 5pm to mark World Autism Day.
It is one of thousands of high-profile buildings around the world to join in the event - including the Sydney Opera House, the Empire State Building and Niagara Falls.
It coincides with a new push by Birmingham City Council in conjunction with Autism West Midlands to highlight the issue of adult autism.
Bus and train advertisements will appear across the city, along with a radio advertising campaign, posters, and a new advice and guidance service.
The architect who designed the Library of Birmingham is up for the Women in Architecture award. Dutch designer Francis Houben has been shortlisted by the Architects' Journal.
Last month the £193 million library was also voted building of the year by the publication's readers.
After being voted building of the year by readers of the Architects' Journal, the director of the Library of Birmingham said:
The Library of Birmingham has been voted building of the year by readers of the Architects' Journal.
The £188 million library opened in September and recently welcomed its one millionth visitor.
The 10-storey building was designed by Dutch architecture practice Mecanoo.
The new £189million Library of Birmingham has today welcomed its one millionth visitor.
Just 100 days since opening its doors on September 3, Joanna Kucper and her baby, Lewis Reynolds, were handed a goodie bag in honor of the landmark occasion.
The milestone means that the new library - the biggest in Europe - has met its predictions of attracting 10,000 visitors a day.
The Library of Birmingham has received 100,000 visitors since it opened last week.
The building, which cost £189 million to build, is the biggest library in Europe.
Bosses originally predicted that 10,000 people would visit each day.
Thousands of people have turned out to enjoy the final day of arts and culture events as part of the 4 Squares weekender in Birmingham.
The three-day festival, which finishes today, has included dozens of performances taking place in Victoria, Centenary, Chamberlain and Oozells Squares.