Ah, Marshall McLuhan revisited, this morning, along Jamestown Road.

The medium: a bumper sticker on a minivan that passed me while I was pedaling to work.

The message: "Get back on a bike," complete with an illustration of a bicycle.

Which I read -- while I was indeed on my bike.

But the person communicating the message was driving an internal combustion vehicle, and not riding a bicycle!

You do see the irony, don't you?