Construct a collage depicting a serene white square, symbolizing a space of endless possibilities, nestled amidst lush plants on a secluded island. This island, a verdant oasis, is set in the heart of a bustling city's river, contrasting the urban environment with a hint of nature's tranquility. The imagery should evoke a sense of isolation and peace, suggesting a 'non-place' where the usual rules of urban life are suspended. The white square stands as a blank canvas, inviting viewers to imagine what could be, surrounded by the vibrant life of the island's flora. This visual metaphor serves to inspire contemplation about spaces, real or imagined, that exist just beyond the reach of our daily routines. There's a subtle edge of the island, which is mainly composed by sand. --ar 16:9 --v 6.0