Il.lusió òptica
No hi ha vermells: https://www.linkedin.com/posts/paulboris_see-the-coke-can-what-color-is-it-from-activity-7189300715209601025-yI9F
No hi ha vermells: https://www.linkedin.com/posts/paulboris_see-the-coke-can-what-color-is-it-from-activity-7189300715209601025-yI9F