Plant stacking Giving grass effect

Hey i recently went into a base and some how they managed to raise the floor on top of a plant giving a grass looking effect..

anyone know how this is done?

thanks for your time

hi, mentioned it in another thread but nvm that :P

They do it by slideing a plant or whatever under the higher floor from a lower floor. If your on union, tell me on my global @dustified, and i'd be happy to help show ya