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Trafalgar Square is one of Britain's most famous landmarks.
It is named after the Battle of Trafalgar when the British Royal Navy beat the French and Spanish navies.
A statue of Admiral Nelson, the man who led the Royal Navy to victory, is on top of a very tall pillar in the middle of the square and is guarded by the statues of four lions.
The square also has other statues on three of its four corners.
These statues stand on wide pillars called plinths.
The fourth plinth is empty and for the next 100 days, an artist called Antony Gormley is using it for his latest work of art.
He is going to allow a different member of public to stand on it for one hour, every hour for 100 days.
So a total of 2400 people will have stood on the empty plinth and they can do anything they want.
One man stood on the plinth dressed as a cat and another was dancing.
Some people also campaigned for charities and the first woman to stand on the plinth tried to draw attention to a children's charity called the NSPCC.
Other people told the BBC that they will just sit on the plinth for an hour to think!
What would you do if you had the chance to stand on the plinth for one hour? Write to us in English!
ماذا تقعل اذا اتيحت لك فرصة الوقوف على هذا العمود؟ اكتب لنا بالإنجليزية
Trafalgar Square
ميدان طرف الغار
landmarks
معالم
Battle of Trafalgar
معركة طرف الغار
Royal Navy
البحرية الملكية
led
قاد
victory
النصر
pillar
عمود
guarded
حرس
plinth
أعمدة مربعة يرتكز عليها التماثيل
campaigned
شن حملة
draw attention
يجذب الانتباه
Safwat Khalaf, Cairo, Egypt
If I had the chance to stand on the plinth I would speak to it by my soul and listen to it and try to image the images of it is hestory. it hase seen what we havent
Alamer, Baghdad, Iraq
I will hold my countrys map and many pictures which could show other peoples who arent caring with our suffering and explain our deep pain and at the end i will cry my country for all my live with shouting help help help...
Ghasan, Sana'a, Yemen
It seems that I would just stand on it and think for an hour, as some people said.
Shimaa Adel, Cairo, Egypt
I think i will raeding my lovely book "cairo at the last 100 year " which wrote by gamal elkhtani
Mehdi Mehdi, Baghdad Iraq
I am an architect i desgin & building columen but i will never thinking to stand on that becuse i fried from high levels
Ahmed, Egypt
I will have a big microphone & talk about Peace & will urge people to love each other & to Co-operate with each other to eleminte wars & fighting & to spread Peace everywhere on Earth.
قد نضطر لاختصار مساهماتكم، ونعتذر عن عدم تمكننا من نشر كل ما يصلنا من آراء.
تعليقاتكم يمكن ان تنشر في اي من وسائل الاعلام التابعة للبي بي سي في مختلف انحاء العالم.