There have been immersive Snapchat Lenses before, but this latest batch can literally change the world around you. Snap has unveiled "Ground Transformation" Lenses that turn the ground into a lava pit or water -- yes, you can pretend the floor is lava like you're eight years old all over again. Both use machine learning to understand the geometry of the land and help apply special effects, such as reflections from the buildings around you.