David Dupplaw's Homepage
- Black dots - Count the black dots.
- Circles - Which circle is larger?
- Elephant - How many legs does the elephant have?
- Gray Haze - Stare at the black dot and watch the haze miraculously disappear.
- Horizontal Lines - Are the horizontal lines parallel?
- Wheel of Fortune - Stare at the dot in the centre and move your head back and forth.
- Colours - Can you read out the colour of some writing?