There is much to see and enjoy at Gegenwelten. The 20th Century in the Neue Nationalgalerie in Berlin, with works by Barnett Newman, Andy Warhol, Sigmar Polke, Gerhard Richter, Otto Dix, Mario Merz and many, many others.

Berlinde de Bruyckere's work is as poignant as sculptures get. Once you've seen them, approached them, walked around them, they will get under your skin and stay there for some time to come.

More than anything De Keyser's paintings celebrate painting and as such life itself. It’s just paint on canvas, nothing more, nothing less. There's no ideology, no meaning, no hidden manifesto and no bravura. Just paint on canvas, but sometimes the paint speaks for itself.

There is much to see and enjoy at the exhibition "Faces in the Crowd. Picturing Modern Life from Manet to Today" at the Whitechapel Art Gallery.

As I entered the Turbine Hall I could hear a voice shouting somewhere from above "Think think think think think think think think think". It seized me by the throat. For a moment I was frozen in my steps. There was no escaping. It felt as if I was thrown against a wall. Shivers ran down my spine.

Some of Hopper's paintings have become icons of 20th century art. This is perhaps one of the greatest honours that can be conferred upon an artist, but the omnipresence of his work in the form of posters and coffee mugs also makes it difficult to approach the original paintings with an open mind.

Why go to a photography exhibition when you can also view the photos in a book, a magazine or on your screen?

It's been awhile since I spent half a day at an exhibition of contemporary art without feeling exhausted and wishing I could stay longer. At 13,000 square meters the Friedrich Christian Flick collection at the Hamburger Bahnhof in Berlin is about as large as the Documenta in Kassel.

Tell me, what is so interesting about those bloody boxes?

Rubbing it in is what Paul McCarthy does, whether with paint, ketchup or chocolate sauce. Excess is the name of his game. McCarthy likes pushing things too far, in his drawings, but most of all in his performances, which always end up a complete mess.