What's the matter with matter?

Matter can have four forms.
1) Outside only
2) Outside and Inside (type 1) only
3) Outside and Inside (type 2) only
4) Outside and two Insides (type 1 and 2)

Objects falling into each of these categories are:
1) singularities, fundamental particles..
2) Balloons, stomachs, hollow vessels, atoms..
3) Brains, Artificial Intelligence machines..
4) Animal Bodies..

Definitions:
"Inside (type 1)" is the space inside a material form (i.e. something that is hollow)
"Inside (type 2)" is mind, consciousness, identity (e.g, mind is 'inside' the brain)