Recognize and name circles and squares in real, everyday objects.
A circle is round, like a wheel, with no corners at all.
A square has 4 sides that are all the same length, and 4 corners.
Mastery looks like: Child correctly names circles and squares in real objects and can explain that circles have no corners while squares have 4 equal sides.
Common stumbles: Child calls any four-sided shape a square, even when the sides are not equal (that is really a rectangle).