What are the most influential visualisations of all time?

With our Customer Conference around the corner, it's time to get excited about the sessions. One of the sessions I am delivering is "The 5 most influential visualisations of all time." In anticipation of the session, I thought I'd ask what you think should be on the list.

I am very excited to be delivering this session - it's something I've been thinking about for over 12 months. My list is finalised; it is in a sealed envelope in a secret vault at Tableau HQ. If you want to be the first to see them, the session is on Wednesday, 9.45am (details here).

My top 5 is bound to be different to yours, so get thinking - let us know in the comments section what you think are the most influential visualisations of all time. And also tell us why. Once you're at the conference, come along and we can compare lists.

(the sealed envelope photo on the front of this blog post is from Zappowbang on flickr)