This post follows from a comment by Steve Knight that the sequential images of the ISS from 31st March could be viewed to give a 3D effect. There are two ways of viewing such image pairs: "wide-eyed" and "cross-eyed". In the first method, you need to allow your eyes to relax as if you were looking at a distant object, while keeping focused on the images. You will see two of each image, and the trick is to allow the two middle ones to move together and overlap; you are then looking at the left image with the left eye and the right image with the right eye. Once this is achieved, the result is striking, because your brain interprets the view in three dimensions.

Cross-eyed viewing works very similarly, except as the name suggests, your eyes need to cross as if you were looking at something nearer than the screen. Holding a finger up in front of the screen can help with this. You will then be looking at the left image with your right eye, and the right image with your left eye. The images are switched so the net effect is the same as for the other method.

The two pairs are labelled to show which method they are correctly positioned for. 

I hope at least some viewers are familiar with one of these techniques, and will be able to achieve a 3D view. Many thanks to Steve Knight for the suggestion!