GREEN SLAB combines plant wall with wallboard by putting the seeds of different species inside the wallboard. The seeds grow while absorbing the rainwater, which results in lush greenery and an energising effect on the environment. The pentagon shape allows freestyle combination that fits walls of any size. Moreover, this technique saves water by reusing it, with the plants helping to purify the mildly contaminated water and absorbing the pollutants. This plant wall provides fresh air and cools the temperature of a space, whether indoors or outdoors, and turns a city into a cosy artistic garden.