Virtual reality (VR) is becoming more commonplace in architectural practice to visualise designs before they are confirmed for the building process. Rather than relying on post occupation surveys that can be bias. By using VR to experience the design, changes can be made during the virtual part of the build measure learn cycle, therefore saving time and money. It is generally assumed in architectural practice that the reactions observed in VR environments are the same as those experienced in a real physical environment. Little research has been done on the validity of this assumption since VR is a recent technology. Project Ocelot aims to further validate virtual reality as a useful proxy that achieves the same physiological reactions as reality. Within Project Ocelot this research is focusing on colours effect on our physiological state in VR. A benefit of using VR to test environments is that space and materials are saved since it does not have to be built in reality, ultimately saving time, money and resources.