Infinity and Beyond

If you think about a set with an infinite number of elements, you might conclude that there is not much to say about the number of elements anymore. Infinite is infinite, right? Well, it turns out that not every infinity has the same “value”, and that there’s actually quite a lot to say about it. Take the natural numbers… read more

Submitted on 26 March 2012

Euler’s Identity

Euler’s identity using Hama beads

Euler’s identity, \(e^{i\pi}+1=0\), must be the most beautiful formula in the whole of mathematics. The expression establishes an amazing relation between five important numbers… read more

Submitted on 11 March 2012

Pinhole QR CodePhoto Page

Pinhole QR Code

I’ve actually found a way to combine quality time with my seven year old daughter, pinhole photography, and QR codes. Together, we created a QR code from those Hama beads that you iron together. Taking the pinhole photo was easy. read more

Burj KhalifaPhoto Page

Burj Khalifa

The glorious Burj Khalifa (Dubai, United Arab Emirates), in the light of the setting sun. The thinness of the photo is meant to emphasize the slenderness of the building. Maybe it doesn't even fit on your screen… For me, the elegance of the thing was striking. You would expect a building like that to appear really massive, but the architects seem to have completely avoided that. In fact, the Burj Khalifa is so slender that some of the cheap replicas at the airport even had the top spike replaced by a little roof… read more

Mars Science Laboratory

Curiosity Mars Science Laboratory rover [image: NASA]

The Mars Science Laboratory (MSL) is one of the most spectacular planetary missions ever. The MSL homepage gives lots of details, and includes a countdown clock to the landing in… read more


Submitted on 7 February 2012

Laundry and PigeonPhoto Page

Laundry and Pigeon

Laundry is always interesting, the shadow below and the pigeon made it perfect. This photo was taken in Trogir. read more

Framed CloudPhoto Page

Framed Cloud

This arch is part of the archaeological site of Burnum, the remains of a Roman military camp. read more

DiverPhoto Page


This guy was really going for it, jumping from the falls in the Krka National Park. He did it a few times, so I had time to choose my position for this photo. It looked as if he was jumping straight into the frothy water at the bottom, although he probably knew what he was doing… read more


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