This device are part of us, they help bring out who we are and what we've got, take for instance you can write in your head but don't have the tools to bring out the words in your head, well except you talk, and that's no longer writing but a speech.
You can play the guitar but no guitar to produce a melodious tone, or perhaps you saw a nice spot and wish to have it as a memory but camera or phone to snap.
This devices are part of us, they help us perform functions swiftly and effectively
Indeed they are indispensable.