A visible penetration of a coin into a glass through its bottom that looks like a miracle. The magician places a clear glass, mouth down on a small plastic coaster to form a transparent container.
He borrows a coin, US 25 C size or equivalent and taps the coin on top of the inverted glass. The coin penetrates through the solid bottom of the glass, and drops inside the glass over the coaster.
It does not require great skill. the specially moulded plastic coaster that we supply with the illustrated instruction does everything.