[MauranKilom]

While a sphere is going to be in the same ballpark, a cube of 1mm³ is presumably easier to imagine.

[projektfu]

Except an ant looks like 3 spheres

[asteli]

For the purpose of this exercise, assume a rectilinear ant.

[SiempreViernes]

The commenter was pointing out that a sphere of volume 1 mm^3 has a diameter of 1.24 mm, while a sphere of diameter 1 mm has a volume of 0.52 mm^3.

Meanwhile a cube of side 1 mm has a volume of 1 mm^3.