Those Cacty(?) where photographed in the "Frankfurter Palmengarten"
This is a 3D picture, in a format, used in most 3D viewers. so if you have a 3D capable device and a picture viewer, just try it out ^^

I hope someone who is interested reads this:

if you want to try and make some 3D content yourself, you can try this free software.

www.chip.de/downloads/StereoPhoto-Maker_38352132.html