Make all kinds of bouncy balls react to sounds from your microphone. A great sound/noise monitor for classroom!
https://bouncyballs.org/
http://chagall-col.spip.ac-rouen.fr/IMG/didapages/description/index.html
See post from last September : http://paulettelovesenglish.eklablog.com/flashcards-physical-description-a118834068
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