[header] How to make a brain out of clay [title] Pinch off two balls of modeling clay. [step] For a brain with a diameter of 4 inches (10 cm), each ball of clay you pinch off should be about 2 inches (5 cm) in diameter. This brain will only be one color. 
Choose a pale pink or gray clay for best results. [substeps] Each ball of clay you pinch off during this step will need to be about half the desired size of your final brain.