[shashwatak]

It blows my mind that those photos was taken over a quarter century ago, hidden by some playful programmers, and are only now unearthed by an entirely different generation of playful programmers. Cool stuff.

[megablast]

I am pretty sure this is not the first time it has been shown.

[dalke]

Indeed, it's been known for a long time.

[joezydeco]

Here's an archived Usenet post with a load of PC easter eggs. It's twenty years old. The Mac SE team picture is listed in here.

http://www.cs.utah.edu/~elb/folklore/Easter-Eggs