iOS 12 + ARKit 2 + Image tracking means: Harry Potter style moving pictures, living movie posters, video postcards, paper-thin “displays,” and lots more augmented reality fun.
visionOS 2 + Object Tracking + ARKit means: we can create visual highlights of real world objects around us and have those visualizations respond to the proximity of our hands.
iOS 13 + ARKit 3 + Body Tracking = An invisible AR guitar that plays different sounds when strummed based on the position of the left hand along the invisible guitar's neck.