Sphere
A sphere is a circle that has been told about the third dimension and taken it very well.
Cube
A cube is a square that was told to think outside the box, and became one.
Octagon
An octagon is a square that had its four corners sanded off, and now has eight of them.
Dot
In 1962 a bureau spent nine years on how big a dot can be; its report was a single full stop.
Cone
A cone is a circle that kept going upward while getting smaller, until it ran out of circle.
Hexagon
Pencils are hexagonal so they don’t roll away; round pencils were trialled in 1840 and are still rolling.
Rectangle
A rectangle has two long sides and two short sides, and a committee to decide which is which.
List of things that are flat
A list of flat things, measured with a ruler, which is also flat and was excluded for a conflict of interest.
Oval
An oval is a circle that has been sat on; the inquiry into who sat on it closed in 1903 for lack of witnesses.
List of things that are round
A list of round things, from circles to the number of times you have gone round a roundabout looking for the exit.