OT: online Mac System 6 Flash?

[Judy Perry]

Inasmuch as tomorrow marks the 25th anniversary of the introduction of
Macintosh, I am wondering if anybody knows off the top of their heads the
URL for the site that has what I think is a Flash-based booting of the Mac
(circa system 6 maybe?)?
I've tried googling but apparently am not using the right search terms.  I
think that the site was in Germany.

Anybody have any ideas?

Kindest thanks,

Judy