I'd pay not to live with it.

Helen, London, UK

If you look at it in a relaxed way the painting comes alive with spectacular colours. When that happens , you realise how closed you normally are to really seeing what's around you.

Andrew G, Woking, uk

It isn't art, it is science,

Terence Kay, Angmering, UK

Wasn't it the french, centuries ago, who would paint certain cells in uneven squares of red and green to drive selected prisoners potty?

Dennis, Portland OR, The American Colonies

I love it and find it exciting. It's an example of 'seeing as'; I can strive to see it as a series of black marks on white, or to see it as the surfaces retreating and rolling together; so sixties too; brilliant!

John Lawrence, London, U.K.

It seems interesting for the first couple of seconds and then it wears thin very quickly.

Also, it's a little bit too boring to look at it again.

Yuri, Dundalk, Ireland

This picture was painted at a time when people were talking about liberating the senses. Here the artist is teasing our visual senses and we enjoy experimenting with the different effects the picture can have on our perception depending on the angle we look at it. Great fun. Fascinating!

Rose-Helene Esteve, Marlow, GB

Bad wallpaper, worse as art. Go drive a bus, give away the paints.

Hugh Mason, West Chester, Pa, USA

I like it, but it does make my eyes hurt after a moment. It definitely has the feel of motion. I am a little more inclined toward M.C. Escher.

Holly Ross, Worthington, OH, USA

I like op art. It has a place in the history of artistic ideas. Today I could replicate this in five minutes in photoshop, but the fact that the more bizarre kinds of distortion filters exist in graphics programs is I suspect largely due to the influence of op art (and Escher).

_Felix, Nottingham,

I love the way Riley makes my visual sense go awry!! Beautifully drawn and executed pictures.( And this is from a man who prefers portraits to all other forms of painting!!)
Somebody compared the picture to a computer graphic. That in itself says it all about how exactly executed the piece is.

Allan, Cowling,

The movement is just as obvious today as it was 47 years ago. This painting is really what the 1960's was all about.

James Patton, Ballynahinch, Northern ireland

How clever this is, it is hard to comprehend this has been conceived and painted by someone. It is compelling to view, drawing you right in to it and at the same time making you feel you should look away. Riley has really thought and captured a unique concept to turn in to a work of art.

Philip, Bristol, England

I liked the Op Art t-shirts of the mid-80's. It is something fun and not too intellectual. Either you like it or don't. Plus, wearing it, you don't have to look at it.

Paul Montgomery, Durham, North Carolina USA

It makes me feel slightly queezy looking at it - still I suppose that's the point. It's clever and I like it. But I wouldn't hang it on my wall.

Michelle, Edinburgh, Scotland

Love it - would like to own it - its fun!

Poosie, Australia,

They used her art work on the Vertigo label. I remember being fascinated as a kid listening to the music while wathcing the L.P. go round with her design on it. At the time interesting but like many things it doesn't last!

Neil, Molesey, England

it captures the moderism and optimism of the post war boom years. it's not just an optical illusion.

Henry Millar, Dorset, UK

More than a few minutes looking at it, and I think I'd get a headache.

Elizabeth , Portland, USA

It's a simple trick, a gimmick. I saw an exhibition of hers at the Tate a few years back. Maybe this was technically interesting in its day, perhaps, but the world has moved on.

David Mills, London, UK

Scientific, crushing, heartless.

Bill Bird, Wallasey, Wirral

I think her work is terrific - you need to see more of it to realise just how clever and thoughtful it is.

Ms jackson, twickenham, england

Yes, it is Art. In fact, it's fantastic. How many works of art does one see that can actually convey a, genuine, feeling of movement? Furthermore, it's hypnotic, in a really good way.

Marc, Paris, France

I feel as if I am being sucked very rapidly into the picture. What a wonderful way to capture the viewing audience !.

Odila, Plymouth, Devon

it looks more like 3D computer graphics from the mid 1990s not so much like its from a paint brush,... to me.

Judah, Nairobi, Kenya

It's interesting, but is it 'Art'? Decorative, yes. Mathematical perhaps. Clever? Art, not really. A bit like a lot of modern art in those respects. But then how do you define art anyway?

Jamie, Scarborough, England

Compelling.

Faustino, Brisbane, Australia