Sounds interesting. For the XO-4, use objects that are at least 3mm thick (front to back), at least 6mm wide, and opaque to infrared.
There's a piano keys mode used by an activity, in case further code tricks are interesting. -- James Cameron http://quozl.linux.org.au/ _______________________________________________ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep