The world is mesmerized by virtual reality (VR) devices, platforms and content at the moment. Global Google searches for virtual reality have quadrupled over the last year, and hardware makers around the world have flooded markets with VR goggles and headsets. Brands have taken notice. Marketers are looking to get in on the new platform before it’s too late, touting VR as the next big thing for digital advertising – even before anyone knows what advertising in VR looks like. Earlier this month, advertising behemoth WPP invested in Imax’s $50 million VR content fund; and a report released in September by the Interactive Advertising Bureau (IAB) found high demand for VR ads among top brands who are now exploring ways…