I can really understand how spatial disorientation can lead to vertigo with the resultant effects. I was returning from a business trip to San Diego en route to the Hughes airport in Culver City. I was sitting in the right hand seat of a Beech King Air and we were flying between two very heavy cloud layers. One aircraft to our right was letting down to the Hawthorn Airport and another was climbing out from that same airport. Both aircraft were inclined in relation to the horizon (which was not visible) and I tried to reconcile their attitude to our attitude and it caused some degree of confusion that is until I looked at the instruments which indicated we were level in relation to the horizon and the other two aircraft were not.
