Don't be alarmed! This strange blob in the Grand Palais des Champs-Elysees is not some alien creature from the Paris sewers mulching everything in its path.
The sci-fi looking monster which seems to appear from round the corner to fill the cavernous expanse is part of the current Monumenta exhibition.
It is the work of British artist Anish Kapoor and the first time he has shown a work in the French capital for 30 years.
Leviathan is 35 metres high and comprised of tautly-stretched PVC over a giant metal frame and is the highlight of the exhibition which opens tomorrow and runs until June 23.People can walk around it and inside it.
Kapoor said: 'My ambition is to create a space within a space, responding to the great height and light of the nave of the Grand Palais.
'People will be invited to enter the artwor to immerse themselves in its colour and it will be I hope a contemplative, poetic experience.'