#1 Depth of Field vs Material
“The fundamentals of light, surface, and movement are key to conveying how objects move, interact, and exist in space and in relation to each other. Realistic lighting shows seams, divides space, and indicates moving parts”
“Depth. Visual layers and realistic motion impart vitality and heighten people’s delight and understanding.”
Google and Apple have very different schools of thought when it comes to the interactions with their devices and applications.
Google has been inspired by the flat design movement and believes that humans should interact with their components as if they were sheets of paper stacked on top of each other. The depth is tactile and makes the user feel that they are holding each screen in the palm of their hand. An example of this would be their card components (shown to the right). Imagine them as “pieces of paper” sitting on the flat background of your phone.
Apple believes that mobile devices should be seen as a window in to another world. They embrace infinite depth in their applications and use components such as their alert buttons and text messages with blurred background to create the feeling that the items are floating and exist in their own space. Another example of this would be the click wheel for their timer. See how the numbers recede in to the background? That would never happen in material design.