1.la percepció

http://www.slideshare.net/rosaurgell/percepci-2217378

[slideshare id=2217378&doc=percepci-091014022043-phpapp01]

més il·lusions òptiques

http://www.slideshare.net/rosaurgell/alucina1

[slideshare id=5292874&doc=alucina1-100926182930-phpapp01]

enganyatalls

[slideshare id=2075995&doc=trampeloeil-090927125336-phpapp02]

anamorfismes

[slideshare id=2075907&doc=anamorfisme-090927122123-phpapp01]