A pencil?
I have a Samsung Galaxy Note 10.1 tablet.
Youtube has many videos of people using the S-Pen that comes with it. I bet they wish they had that pencil as it looks as easy to use as a well a pencil.
The one that comes with the Note is S-Pen is clunky in comparison but people can draw and paint some amazing images. You can buy better ones.
Here is an apple being painted using Sketchbook Pro on the Samsung Galaxy Note https://www.youtube.com/watch?v=nb32e4XN_1c