Who knows what a hologram is? Take, for example, the Hungarian 1000 forint note. That larger head on the right is King Matthias. Do you see that smaller, shiny portrait of King Matthias on the left? That's me! I’m a hologram! I started as an exciting experiment, but as you can see, I have now become an important security tool, because there is only one way to make a copy of me: with a copy of the original hologram. But it took a long time to reach this point, almost a hundred years. My invention is linked to the name of a Hungarian scientist, Dénes Gábor. In 1947, he invented the process called holography that is necessary for my production. It is an imaging process that captures the subject of the image in three dimensions. This means that the depth of the captured object is also visible, i.e., the entire body. Gábor Dénes also named me after this quality by combining two Greek words: holosz ("whole") and grapho ("writing"). What is particularly interesting about my invention is that for a long time only the strictly scientific public knew about me. The big change came in 1963, when two scientists living in the United States improved the process and used laser light instead of electron waves during my production. I became famous in one fell swoop, and the rest is history. Dénes Gábor received the Nobel Prize for Physics in 1971, Emmett N. Leith was honoured by US President Jimmy Carter in 1979, and Juris Upatnieks registered a total of 19 patents related to holography. I have been placed on various currency notes and documents, explosions and objects are investigated with me, and even a fictional Japanese pop star owes their existence to me.