Interestingly, children tested on Easter Sunday are more likely to see the figure as a rabbit, whereas when tested on a Sunday in October, they tend to see it as a duck (Brugger and Brugger 1993, Kihlstrom 2004). Brugger (1999) has provided a comprehensive catalog of duck-rabbit variants, along with data on their ease of reversibility.
但您問錯了
Don't know where God is but the Devil is in the details