Last week in a moment of weakness I purchased some computer software. It looked potentially useful and since it is such a pain to trek down to Murdoch to use it I bought it. I must admit I was seduced by the massive discount for students.

Yesterday, this arrived in the post (airmail from the USA):

Dear Colleague,

You recently ordered a license of IDRISI Andes for digital download.
Please find enclosed a pair of 3-D glasses for use with the anaglyphic display features, accessed through Composer. You will need a stereo pair of images (such as from Quickbird or ASTER). Review the Help System for Composer for details on the operation.

Thank you for using IDRISI Andes!

The Clark Labs

Enclosed:

Yes, they are cardboard and cellophane.