Through that temporary installation, people of NRC were able to gather information on how visitors of the installation reacted to the multitouch ice. How they perceived the paradigm shift from cold, inanimate ice to reactive interface.
To quote the Nokia Conversations post regarding the installation:
People saw this as a more natural screen interaction, well-suited to the cold winter conditions in the city. This is computing interaction without computers. And while the wholesale use of ice as building blocks for the devices of the future is perhaps unlikely to catch on, the idea of natural, ad-hoc screens anywhere is very much a taste of where we’re headed.
I must say that I would have loved to have been there to try it.
Source: Nokia Conversations