In the OQ task the children were given colored play-dough, which they used to construct
models of the earth, the sun, and the moon. In the FCQ task, the children selected one of
four pre-constructed play-dough models of the earth, about 10 cm in diameter, representing
a round earth, a truncated sphere, a ring earth, and a flat earth. The model of the ring earth
was added to the other models used in the Siegal et al. (in press) studies because it has
been found to be a popular model with the Greek children (Vosniadou et al., 1996). All
play-dough models are shown in Photograph 1.