If a painter was a computer engineer...

Our friend painter in everything-as-computer-engineering-world wakes up every morning and starts painting at 9.30 AM. He knows what he has to do: he has to paint a certain picture. He has the picture in mind and he has been taught how to paint it. He starts painting and realizes that his favourite black pen is painting blue ink today. "Oh, I saw that happening sometime. It is not a reproducible problem, and I don't know what's going on. Last time I stored the pen in its box, opened it again and it painted black again". So our friend painter does what he thought it would work but, to his surprise, the pen is still painting blue afterwards. "Damn, there is something going wrong in here. I will check the documentation". The painter reads the documentation of his favourite black pen and searches for a section called F.A.P. (Frequently Arising Problems). He searches for the point "My pen is painting blue instead of black. What can be going on?". "Yeah, that's it, here we go". The documentation says: "We are aware that, under certain circumstances, this pen might paint in different colours than the one it is meant to paint. Please check for an updated refill".

Got it. Our friend goes to an ink shop and asks for an updated refill for his pen. He asks the seller, Mr Google, "What should I order? My pen is painting blue instead of black today". The seller opens a book by its first page and gives him several options:

Mr. Google - "Did you check the humidity of your painting room? Above 64% of humidity may cause your pen to convert black into blue ink. I have an updated refill that will avoid this problem at least above 40% of humidity.

Unsure of that, the painter goes back home and checks its humidity. 55%, nothing to worry about.

Mr. Google - "Did you dream with Russian women? Some people are experiencing blue ink after dreaming with Russian women. In this case you may want to wait for tomorrow, there is no known fix for that problem."

The painter hesitates for a while. "I don't remember what I dreamt!".

Mr. Google - "Do you feel rather depressed? Some depressed people have experienced random blue ink. To solve this issue, you have to draw using your left hand until the black colour is back."

The painter thinks about it. "I could destroy what I've done so far by trying to paint with my left hand. And I can't depend on drawing with my left hand: that's not a scalable solution!".

Mr. Google - "If you are painting inside a 32 square meters room, moving to a 64 square meters room may help".

"OK, but my flat is not that big...".

Mr. Google - "Does this pen really fit your painting project? There are too many opened issues for it. Maybe you should consider using a different pen?"

"Damn! I would have to repaint everything from scratch! In everything-as-computer-engineering-world, it is not possible to paint something with one pen and then continue painting it with another pen."

Mr. Google looks at the second page of its book - "Did you hear a man laughing downstairs while you painted blue for the first time? In that case there is a known fix for the problem."

"Ah, the man laughing downstairs. It remains me of something. What should I do?".

"Just go change the blue refill he put in your pen by a standard black one. And think about a revenge".