About the rose, considered the queen of flowers, a treatise could be written. The myth tells us that when Aphrodite (Venus for the Romans) was born, from the foam of the sea that slid down her white skin, a wonderful flower arose from her chest, it was a splendid white rose and Bacchus, approaching, dropped from his glass a drop of wine, then the whole rose was stained red. Thus, the white rose became the symbol of light, purity and the birth of the day, and the red rose that of love, passion, and death. The most precise symbolisms come from their variety of colours and the number of leaves or petals, a yellow rose signifies the Work done, a goal achieved, the blue rose the impossible, the pink one is the symbol of regeneration, due to this interpretation in ancient times a crown of these roses was placed on the graves, with a ceremony called "Rosalia". The reference to the red rose and love, we find it outlined in the poem "Romance of the rose" where Guillaume de Lorris describes it as the tabernacle of the garden of love of the knighthood, today in Catalonia this meaning is remembered on the day of Sant Jordi. The Christian symbolism has given several meanings to the roses, the red rose associates it with the martyrdom and the wounds of Christ. The rose windows of the churches want to represent an open rose seen from above, meaning the entire universe created, that is why it is important that it has all the colours. The practitioners of the cult of Dionysus (Bacchus for the Romans) used to adorn themselves with a crown of roses with the belief that its perfume counteracted the effects of the wine and prevented that under these effects it was said more than was convenient, with time the rose was converted with the symbol of discretion, the Catholic confessionals adorned with a five-leaf rose carved with wood, in the rooms where secret matters were discussed, one or more roses were painted on the ceiling, and over time the custom drifted towards the rosettes where the lamps were hung, the boxes where some secrets were kept were adorned with roses, hence the expression as soon as a secret is entrusted, it becomes "sub pink". In the 17th century the rose became an important hermetic symbol. In 1619 Heinrich Khunrath published the work "Christian-Kabbalistic Amphitheater of the one true eternal wisdom", where he uses an open rose to symbolize the relationship of man with the entire created universe. Placed on a cross it becomes the symbol of the esoteric society of the Rosicrucians. It is also the flower preferred by alchemists where the white and red roses are the symbol of the dualism of the two primary principles, sulphur and mercury, the seven-petalled rose where each one refers to an operation of the Great Work.