Csíkszentmihályi puts difficulty (challenge) and skill on the axes to map mental state (encapsulating interest). http://en.wikipedia.org/wiki/Flow_(psychology)

Csíkszentmihályi puts difficulty (challenge) and skill on the axes to map mental state (encapsulating interest). http://en.wikipedia.org/wiki/Flow_(psychology)#Conditions_for_flow http://en.wikipedia.org/wiki/Flow_(psychology)#Conditions_fo...