My second density cat can see and touch me.

[zenmaster]

Alternative would probably be not needing to be there. Finding yourself where you don't need to be.

What mechanism could allow that?

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I had read somewhere (can't remember where, perhaps here) that 4th density beings hiding themselves for their own protection. I don't believe 3 density beings can harm them, I think it is more the 3th dimensional vibrations that can be harmful for them.

I think the idea is to learn the lessons that the 4D vibration provides. The thoughts that 3D entities have, vibrate based on a mind of that density's nature - they resonate with the particular density (or subdensity). Similarly, the thoughts that 4D entities have, vibrate based on a mind of the 4th density nature. Thoughts are what allow teaching and learning and, along with the supporting vehicle, provide the movement up the subdensities and densities. This movement is one of allowing and incorporating more and more of self which is of a less distorted (higher vibratory).

The shielding is for 3D entities as 4D energies, left uncontrolled can disrupt 3D (higher controls lower). The 4D-native body has a strong "psychic wake" which greatly disturbs 3D energies - hence the visitation in "astral" form or from "robots".

I'd read where the feeling of a 3D body, for a 4D entity, is something akin to the feeling of being underwater - hampered and slowed down.