The new representations enabled by the educational computer game the "Juggler" can place vectors in a central role both for controlling and measuring the behaviours of objects in a virtual environment simulating motion in three-dimensional spaces. The mathematical meanings constructed by 13 year-old students in relation to vectors as objects, as a set of properties and as representations of vectorial entities are reported and discussed in this document. It is argued that playing in the "Juggler" game could make a considerable contribution to the development of intuitions and to the generation of meanings related to vectors through the use of vectorial properties. (Contains 3 figures.)