Elemental.

After yesterday's all-time classic this is something a little more involved and (if you're of a scientific mind) altogether more romantic.

This is "Visual Elements Trumps" as produced by the Royal Society of Chemistry and available from the following link.

http://www.rsc.org/get-involved/visual-elements/trumps.asp

They are, in a word, beautiful. They're also educational and fun. I can't recommend them highly enough but beware! - they are fiendishly addictive.