The tongue map is a myth: every part tastes everything

This is how Gaston tastes lemons.

Side of the tongue only. The poster said so.

Gaston: Sweet at the tip, sour at the side! It is on a poster!

Pip: The side of my tongue loves ice cream.

The Wolf: Every part of the tongue that tastes can taste all five tastes. The differences are only mild.

Gaston: But I paid four euros for this poster!

Pip: Sour. Everywhere. Free of charge.

Gaston: Tongue maps! Five euros! Very scientific!