... this seems to be a crack monitoring device, installed on the fenced wall of this
Former Hollywood Road Police Married Quarters. The building was vacated a couple years ago
and the site was once on the Government's List of Sites for Sale.
Yet subsequent to various oppositions and further investigations,
its historical value was finally confirmed and the site was
removed from the List for Sale in 2007 (for one year).
The Government is now inviting "Revitalization Proposals" instead...

Staunton Street, Aberdeen Street, Hollywood Road, Hong Kong