Thank you all for this concise answer!
jims: May I ask what data you looked at for your calculation? Could I extract this from the sensor's data sheet?
Consuming my serial port: Since output would be controlled by the computer, this is no problem. I will only construct an input device.
So a MUX is basically a kind of splitter I can read with a channel as a parameter which is mapped to a pin of a device I connect to the MUX?
If I get it right, the advantage of analog sensors is a higher sample rate. Does this mean I could get a reading more frequently or do I get more resolution, i.e. I could measure a more exact degree of inclination on a larger scale?
As for my last question, I realized it was a little bizarre, however it is interesting to get advice about these things also. I have to say I did not exactly understand what you suggest (scrunching? knotting?)
trialex: When you hold a cup in front of you, aren't you able to pour on two axis, i.e. left and right or towards and away from you?
Daniel: I think I would prefer a simpler but more expensive setup (i.e. one smart sensor) to many sensors.