Should no new tweets be posted for a while, the screen of the electronic paper display will refresh and go into slideshow mode, showing older images containing the necessary tags. (visionect.com)
If you drop some mp3 files in the same directory as some pictures, those mp3's will be used as a soundtrack when in slideshow mode (thenowhereman.com)
Show relevant slide in full slideshow mode, have two pupils up at board - then click through to display a word, pick another pupil to describe it without using the word, first pupil at board to guess correctly is the winner and stays on. (tes.com)