Eurydice talking about blueprints
After I heard about this secret archive, I got curious and found this blueprint... I cross-referenced it with the other floor plans of the university, and I found something strange.)
I don't think Eurydice using the term 'blueprint' makes sense. The term is rather akin to 'our' world ( *construction* plans actually being printet on blue paper)
Not sure how magic is affecting it in your worldbuilding but Caits world does strike me as one where the color blue is pretty expensive (even though the academy students uniforms are blue (or maybe even bacause of that?) - status symbol for *the* magic academy probably)