[Ezekiel]

...a perfect, pure blue, a color so magnificent and transcendent that it was all but impossible to describe. Yet, for most of the last 2,000 years, nobody has known exactly what “biblical blue” — called tekhelet in Hebrew — actually looked like or how it could be re-created.

People see it without realizing, because it's the Windows default color for highlighted text. Copy, then paste (glue). Like the concept of see and do (repeat, imitate).

Glued. Bonded. Intertwined like tzitzit. People have forgotten how to do that, being so busy with their faces facing an impersonal screen. Irony. Windows to the soul.

[Phinneous]

I researched and presented a whole class on techeyles once. Of course you probably know that there is an orthodox, though minority, opinion that the correct crustacean has been found and the blue dyed tzitzis can be seen again.

https://goo.gl/images/oazzn9

And Sunken Civ’s article is the murex snail, I believe. What the modern researchers found is that exposing the blood (or bile) mixture of the snail to sunlight for longer times made it shift from reddish purple to the beautiful blue seen in the link.