The new Welcome to Optimism app is now available to download free from Ovi Store.

The new Welcome to Optimism app is now available to download free from Ovi Store. Get news and other rubbish from Wieden + Kennedy London direct to your multimedia mobile device.

Because a day without Welcome to Optimism is like a day without sunshine. So don't leave home without it.

We popped down to the Nokia World conference this week and demoed a bit of fun we've been working on called Paint Wall. Though it's only a simple little app, we displayed it on the biggest screen we could find – a 6m by 3m wall of LED lights.

The app allows you to play with digital paint in a variety of ways: You can "tap" paint using the touchscreen. You can "throw" paint using the amazingly accurate compass and the accelerometer. And you can "spit" paint using the device's microphone.

Oh, and you can also throw photos as well as paint. Paint Wall is a project that we've been working on with Greyworld.

You can also see the wall in action towards the end of our launch ad for the new Nokia N8 smartphone.