Here’s a Subliminal Channel You Haven’t Considered Before – Source: www.schneier.com

Clive Robinson • June 24, 2025 10:50 AM

@ Bruce,

I might not have thought about it with regards water/ice due to basic physics and the energy involved.

But think back to multi-layer storage in Optical systems and “Magnetic bubble memory”.

In some cases they used nonlinear “solids” and multiple energy sources to fix a point in 3D space and turn it from solid to vapour phase state.

The resulting bubble had curious optical properties that enabled it to be “read through” as well as being “a read target”.

So the idea gas sort of been around for a half century or so, just not very practical in most cases.

And that’s the question to consider here,

“How practical is this water/ice system in room temperature operating environments?”