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Abacus mode #261
If there ends up being a lot of interest in novelty features/modes like this, I wonder if they might be good use cases for an extension system. Maybe we should keep track of these proposals for use as motivating examples for the design of such a system if one is ever implemented.
Alternatively people could make their own forks for this sort of thing, but then there's still the question of how the project could be factored to make it easier for forks to keep up with changes in the default app.
Why would we need this?
For most of the asian countries the abacus is still thought in school, enabling the later teached mental abacus. The mental abacus system has shown even greater impact on the individuals abilities to solve mathematical operations. 
Most of us would agree on the unnecessity of such a feature published to the millions of already pleased windows user, but we should focus the discussion on our responsibilities emerging out of the designs we, as software engineers, publish to all of our users. It is up to you to decide whether you want to reintroduce such nearly forgotten methods for the benefit of something greater.
What should be accomplished?
Since the abacus efficiency relies on speed the controls have to be as easy and fast. Preferable fully keyboard controlled
What we dont need are any additional features making it more complicated, e.g. no options to adapt the style of the feature in any way. You can't do it with your real abacus as well, it comes as it comes.
Very interesting approach. At first i thought this is a troll issue and it fully escalated into a very interesting feature with huge potential in research and development, especially for concepts of the modern calulator. As everyone in this discussion is already in picture on the concept I dont think that this issue will be solved with a new feature pitch. This is unquestionably more and Microsoft should absolutely look into this. The abstract of @mamichels shows that this is by no mean a "novelty feature" and could have great potential on the windows calculator. I'm really looking forward for this, please keep us updated.