The Apple File System (APFS), introduced in 2017 to replace HFS+, has many featues, including cloning of file blocks. The cloned blocks are the ones in the snapshots of the original file blocks and a. can be modified or not depending on Apple device type.
b. can't be modified.
c. need to use a VM.
d. can be modified.

i'm pretty sure data is stored in a form

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?