In case anyone is interested, the name of the art supply store "Farben Kasten" is most likely a parody name of "Faber Castell", a real life art supply company. They always had the best inking pens and pencil crayons. <3
Sensei must use some of their products.
Maybe. Or it could be taken from German. 'Farben' means colors, and 'Kasten' means boxes. 'Farbkasten' means paintbox(es), and the author could've just preferred to keep the words as two separates.
+ Although Faber Castell is a German company too, I think.
Yup! Their headquarters are in Germany. Though looking at it, I seem to have made a mistake, and it's actually a coincidence for the store... Sorry!
Faber-Castell is actually someone's name. Kaspar Faber was a cabinet maker, and the business was carried on through his great-grandson Lothar, who eventually had a granddaughter that married into the Germanic "House of Castell", and adopted the name "Faber-Castell".
Admittedly, that's one hell of a coincidence for Farben Kasten to seem a lot like "Faber-Castell". Even carry similar products.
http://manga-room.com/manga/papa-to-arukou/version-2-chapter-1 Found the full version of Chapter 1 here, in case people are confused by the sudden jump.