Our other senses – the five senses – are open and obvious; but this – our hidden sense – had to be discovered, as it was, by Sherrington, in the 1890s. He named it ‘proprioception’, to distinguish it from ‘exteroception’ and ‘interoception’, and, additionally, because of its indispensability for our sense of ourselves; for it is only by courtesy of proprioception, so to speak, that we feel our bodies as proper to us, as our ‘property’, as our own (Sherrington 1906, 1940).