Click on any bubble and an information box comes up. This box is for a nearby cafe, that one for a hotel, those others for a range of points of interest: the gardens themselves and, beyond, Old Melbourne Gaol, Victoria Market, the Eureka Skydeck and Federation Square.
There are many other bubbles on the screen — for businesses, landmarks, sporting venues, dozens more natural features — all containing location descriptions, facts about the subject, opening hours, user star ratings, links to web pages and so on.
Welcome to augmented reality, the digital revolution that integrates location and data.