LONDON -- If the sign of good art is Watch Mom's Guide to Sex 12 Onlinesomething that provokes discussion, then David Shrigley's new statue -- "Fourth Plinth", which was unveiled on Thursday morning in London -- is already on track to be a winner.

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As the cloak was pulled back, people gathered in Trafalgar Square to catch a first glimpse of the statue.

Behold, "Really Good".

"'Really Good' is a seven metre-high hand giving a thumbs up," reads the statue's plaque.

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"Cast in bronze, with the same dark patina as the other statues in the square, the thumb is disproportionately long.

"Shrigley's ambition is that this simple gesture will become a self-fulfilling prophecy: that things considered 'bad' such as the economy, the weather and society, will benefit from a change of consensus towards positivity.

Many people were a big fan of the big thumb.

Others, less so.

One man was even slightly unnerved.

Meanwhile, many were obsessed with how phallic the thing looked.

It's not every piece of art that manages to inspire joy, irritation, fear and lust with one simple hand gesture.