The Helsinki virtual central library is one of our long term projects. It is executed in collaboration with central library ICT group and ALA-architects. Phase one included a simple virtual reality environment visualizing the spaces of the library model for better understanding of the possibilities, dimensions and possible challenges of the future library environment. In lately finished second phase the experience was expanded with interactive tools to help design the functions of the public interior spaces. The practical virtual experience with interactive tools enables collaboration with designers and endusers in a new level and ensures better quality and fewer mistakes in the whole of the project. The library it self will be finished in December 2018, but the virtual library will have a lot interesting things to offer also for public before the opening ceremonies.