Organize the five pieces to form a €50 ticket. You have to choose faces in reddish colors.

He then rotates the pieces so that the faces are visible in greenish colors and builds a €100 bill.

Where is the missing little rectangle?

The explanation

Un recorregut històric de les paradoxes de desaparicions geomètriques

The first known record of these puzzles appears in the book "Lbro Primo di Architettura" by Sebastiano Serlio (1475-1554) a Renaissance architect.

In the text of the image, Serlio explains how to transform the ABCD rectangle of 3×10=30 units into two rectangles, the yellow of 4×7=28 and the one formed by the two blue triangles of 1×3=3.

Martin Gardner he dedicates a chapter of his 1955 book Mathematics Magic and Mystery to geometric disappearances. As always, his explanations are very understandable.  You can read it here in Spanish (PDF).

The Quirinus Puzzle

This geometric disappearance version from 2012 is the work of Gianni Sarcone and Marie-Jo Waeber they call it Puzzle Quirinus, you can download the PDF to print it, play with it and of course, look for an explanation.