There are lots of different methods to find out what the shapes are worth - how many can you find?
Water freezes at 0°Celsius (32°Fahrenheit) and boils at 100°C (212°Fahrenheit). Is there a temperature at which Celsius and Fahrenheit readings are the same?
Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?