Jochen Lempert is a photographer with a background in biology. That shows in his work. Lempert's images look like formal renderings of a man viewing the world with a scientifically formal gaze.

But Lempert's images are a lesson in looking.

The picture is called Plastic Bag, yet you are looking at a transparent mushroom, or is it a jellyfish? A wall with 47 different species of  Great Auk (he wants to photograph all the species in the world) shows a scientific collection. You start looking at details you would not have observed. A close-up of a plant what could also be the plumage of a bird, or is it?

Today I went to the Gemeentemuseum for the second time to see Erwin Olaf's retrospective. In honour of his sixtieth birthday, the Fotomuseum Den Haag and the Gemeentemuseum have organised a combined retrospective.

Last time, we started in the Fotomuseum. Olaf's early photos are on display here. This is generally the rawer work, mostly black and white. In the Gemeentemuseum, the more stylised work of the older Erwin Olaf is exhibited. Top work, related to Jeff Wall and Gregory Crewdson.

American photographer Sinna Nasseri.

German artist Grete Stern.