Of course neither me nor any of my colleagues had an appropriate protection to view the upcoming solar eclipse. So I had to ‘hack’ together a device to still be able to watch the eclipse pass in a safe manner.

Solar Eclipse (Munich, Germany, 2015.03.20 10:40 CET) viewed though a simple (5 minute hack) pinhole camera:
The camera was built from an old rolled conference poster, some adhesive tape, plastic foil, and a cardboard box. I think it is self-explanatory:
One side was covered with opaque foil, only a tiny pin hole (< 1 mm) let light through. The other side was simple plastic foil (from my lunch). The box acted as a shield to protect from accidentally looking into the sun.

It’s a mirror image, by the way.

Additionally (out of curiosity) I’ve taken a photo with my iPhone 4S:
The eclipse can be seen in the lense flare (here a 100% cut-out):