1. Departement d’Informatique, Université du Québec à Montréal, Montréal, QC H3T 1N8, Canada
2. Wellcome Centre for Human Neuroimaging, University College London, London WC1N 3AR, UK
3. Department of Experimental Psychology, University of Oxford, Oxford OX2 6GG, UK
4. Department of Philosophy, Macquarie University, Sydney, NSW 2109, Australia
5. Department of Mathematics, Imperial College London, London SW7 2AZ, UK
6. Department of Business, Law, Economics and Consumption, IULM University, 20143 Milan, Italy
7. Department of Informatics, University of Sussex, Brighton BN1 9RH, UK
8. Spatial Web Foundation, Los Angeles, CA 89114, USA