Portrait Window: When the note is held against the light, the window in the hologram becomes transparent and reveals a portrait of Europa, which is visible on both sides of the note. Portrait Hologram: When the note is tilted, the hologram – the silver-coloured stripe on the right of the note – reveals a portrait of Europa as well as the "€" symbol, the main image and the value of the banknote. Emerald Number: When the note is tilted, the number "20" on the bottom left corner of the note displays an effect of the light that moves up and down.