I was told, there are still some local painters in Morocco who sketch using an invisible ink (a traditional mix of green tea and saffron). The sketch becomes visible only when put over heat.
We walk today in the narrow alleys of Ait Ben Haddou, the old fortified city, a once-upon-a-time major stop along the caravan road that connected the Sahara and Marrakesh with Timbuktu in the south (many signs still inform the visitor that it takes 52 days by camel to reach the famous city of Mali). Today the city is a Unesco Heritage site and a beloved set-up for many movies like Gladiator, Babel or The Prince of Persia.
As we move along, it feels as if the echo of so many before us is still audible and the footsteps of so many to come are already visible. There is an ancient human need to permanently connect with each other and we all step on the sketch lines of an invisible painting which comes to life through the warmth of our hearts.