Author: Sáez Castán, Javier
- Children/Young
- Ekare
- ISBN: 9788493486358
- Release Date: 01-01-1970
-Reviewed by: America Reads Spanish

The author and illustrator of this picture book is an unclassifiable creator, capable, like the characters of “Mr. Verde’s Afternoon Snack,” of remaining hidden behind the foliage, or of surprising and fascinating whoever pauses to look. An invitation from Mr. Green brings together Mr. Yellow, Mr. Purple, Mr. Blue, Mr. Brown and Mr. Black. Once gathered at his home, the host reveals the motive for such an unexpected meeting. He has discovered a mysterious poster written in Latin that proposes a surprising challenge and he warns that if they dare to proceed, everything will change.