In August 1942, Johan Voskuijl built a hinged bookcase to conceal the entrance to the Secret Annex.
Bobbin used to open and close the bookcase
The hidden entrance to the Secret Annex
‘Our hiding place has now become a true hiding place. Mr. Kugler, you see, thought it would be better to place a cupboard in front of our door, (there are a lot of searches being carried out for hidden bicycles,) but then of course a cupboard on hinges that can open like a door. Mr. Voskuijl built the piece of furniture.’
At the back of the bookcase, a wooden bobbin hung on a piece of rope attached to a hook. It was used to open the entrance.
The original bookcase is still part of the museum today. The bobbin is fragile and therefore kept in the depot.