Perception tests and optical illusions: 

http://www.exploratorium.edu/seeing/exhibits/

http://www.eluzions.com/Illusions/

http://kids.niehs.nih.gov/illusion/illusions.htm

http://www.michaelbach.de/ot/

Emotional intelligence test for kids:

http://www.mitest.com/omitest.htm

Useful websites:

The Ainu people of Japan: http://www.workingdogweb.com/Ainu.htm

Sami people of Lapland: http://boreale.konto.itv.se/samieng.htm

San people of the Kalahari: http://www.woodsmoke.uk.com/p/v/Courses/The+Kalahari+Adventure

http://www.theartofafrica.co.za/serv/whoarebushmen.jsp

Native American people: http://www.ahsd25.k12.il.us/curriculum%20info/NativeAmericans/index.html

Maori people of New Zealand: http://www.history-nz.org/maori.html

Aboriginal people of Australia: http://www.aboriginalculture.com.au/index.shtml