With his Metro Card Mosaic Art, Juan Carlos uses discarded plastic metro cards, which he cuts into different shapes and pastes them together, to form pictures and messages. The idea of using these non-biodegradable cards, is to reinforce recycling and prolonging the card's use indefinitely, while providing the artist with a source of free material. It is also a way of reminding us about the danger this material can cause, if left to seep into the earth. ​​