" Keeping surfaces clean." This stuff would be a mess if we could see both textures.
"Clean lighting" I removed the blue crystal slab to reveal the (otherwise) invisible white light-rod. On the second floor of the tutorial ship the floor has red crystal giving each floor a unique color-tone.
"The disappearing Plant" From outside the ship you see no plant...but go inside and: voila.
"Weapon Nacelle" from AVN drone fighter. My favorite effect. These nacelles were an experiment in simulating some kind of 'charge' that gets fired. Looking from different angles the red crystals are a continuous line, absent altogether or as shown; a broken line. Doubtful anyone could see this in combat. This is just evidence of my 'rich inner life'. :D
"Quirky" Many transparency effects are subtle. Very little earth-shattering effects but I do play them for fun.
"Simple yet elegant" Red crystal fronting a charged cct background providing ghost-light (no source).