trash collectors

this picture shows the trash collectors that are located EVERYWHERE around UAM-A.
As far as I know, the idea of placing together two different trash collectors, distinguished by their color (red and white), came from students and/or teachers of the ambiental engineering.
* The white one collects disposable things.
*The red one collects all the rest.

despite the fact there are thousands of these collectors in the uni, there is sometimes trash on the ground....
that´s quite frustating, annoying and sad.

let´s keep fingers crossed in order to see the day when people understand the usage of these collectors.