Would love to visit this Grimm brothers museum when next in Germany. I especially liked this part of the introduction:

The exhibition is structured according to the letters of the alphabet – but not alphabetically. The tour begins with Z for ZETTEL (English: bit of paper). But this is not the only surprise awaiting you on your way through the Grimm universe.

As for the nails in the wall, just imagine what they’d have achieved with blu-tac!