He wants facts and reality in his scope, not intangibles that he can't grasp.
Property does not however include intangibles or things in action.
Now, however, more and more wealth is tied up in intangibles such as intellectual property, patents, brands, media, and contracts.
This is not the case - such intangibles can be enhanced or degraded or protected or neglected - a whole range of options.
Nor are trade secrets, good will, or other valuable intangibles.