I learned to play the piano without a piano

From the article:

I Googled the dimensions of a keyboard, drew the keys on to a piece of paper and stuck it on my desk. I would click notes on an online keyboard and “play” them back on my paper one – keeping the sound they made on the computer in my head. After a while I could hear the notes in my head while pressing the keys on the paper. I spent six months playing scales and chord sequences without touching a real piano. Once my mum saw it wasn’t a fad, she borrowed some money from family and friends, and bought me 10 lessons.