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To try this, print out the page first.
These strips represent a spectrum from each of the seven major classes of stars, O, B, A, F, G, K, M. Click on the image for a page you can use to cut out these strips and rearrange them in a way that you feel is logical flow from one to the other based on the appearance of the absorption lines, the whiteness or darkness of regions of the strip, etc. Then imagine you had 400,000 of these to arrange instead of 7, and you'll see why Annie Jump Cannon was such a heroine to astronomy.
When you think you've figured it out, check the correct answer.
(Images courtesy of NOAO/AURA/NSF, with special thanks to Brad Armosky and Dr Mary Kay Hemenway from McDonald Observatory. A teacher's PDF version of a similar exercise can be downloaded here .)