The Medium is the Message

http://www.log24.com/log/pix10/100222-McLuhan.jpg
Marshall McLuhan

From the Wikipedia article
on Marshall McLuhan–

McLuhan 'tetrad' figure with four diamonds surrounding a fifth, the medium

From yesterday—

(Click images for some background.)

Ian McKellen at 'Neverwas' diamond windows

Related material:

Feast of St. Louis, 2003,

a web page on McLuhan's
student Walter J. Ong, S. J.,

and Jung and the Imago Dei