Natural rubber at least showed promise as rubber sources, include the rubber fig ("Ficus elastica"), Panama rubber tree ("Castilla elastica"), various spurges ("Euphorbia" spp.), lettuce ("Lactuca" species), the related "Scorzonera tau-saghyz", various "Taraxacum" species, including common dandelion ("Taraxacum officinale") and Russian dandelion ("Taraxacum kok-saghyz"), and perhaps most importantly for its hypoallergenic properties, guayule ("Parthenium argentatum"). The term gum rubber is sometimes applied to the tree-obtained version of natural rubber in order to distinguish it from the synthetic version. The first use of rubber was by the indigenous cultures of Mesoamerica. The earliest archeological evidence of the use of natural latex from the
But what about the noise of crumpling paper which he used to do in order to paint the series of "Papiers froissés" or tearing up paper to make "Papiers déchirés?" Arp was stimulated by water (sea, lake, and flowing waters like rivers), forests the letters sent as response to one of John Cage's letters made by Greta Ströh, the director of the Arp Foundation at the time. Even though Cage's inspiration came through the works by Arp, the composition is dedicated to Les Percussions de Strasbourg. This piece features what are often called by John Cage "sounds of nature", which consist of sounds that resemble environments, and use word in his music, therefore blurring the line between music and literature, as he did in "Child of Tree", "Food" and "Ryoanji". This piece was finished in August 1985 and was published that same year