It's 10:30 in the morning, and the sidewalk along Plaça Catalunya, between Carrer de Pelai and Ronda de la Universitat, is beginning to fill with color. Yellow, red, lilac, green, orange... The chromatic ranges are grouped and mingled within vases of different sizes and shapes placed on shelves. It's the first day that the traditional flower vendors of La Rambla have set up shop a few meters further up from their original location. The street is filled with the noise of handcarts going up and down to unload flowers and sacks of seeds, and the scent of the floral arrangements permeates the air. Behind the counters, going in and out, the stallholders bustle about. It's moving day, and that's synonymous with "madness," says José González, a florist on La Rambla for 30 years: "It's all new, and I have to adapt, taking it one day at a time and without missing a beat."

In the historic Down House, the house where Charles Darwin lived for 40 years in Kent, England, there was a space that was key to developing the theory of evolution that would bring the English naturalist worldwide fame. And it's not the table where he wrote The Origin of Speciesbut rather his garden. There, Darwin spent hours conducting small experiments with plants, such as the so-called Darwin's orchid or Christmas orchid, from Madagascar. It is a very particular species, with an extraordinarily long nectary, over 20 centimeters. The scientist predicted the existence of an insect capable of reaching the hidden nectar. The butterfly would be discovered decades later, confirming an intuition based solely on botanical observation.