Snowflake in the same micro-environment does not guarantee that each arm grow the same; indeed, for some crystal forms it does not because the underlying crystal growth mechanism also affects how fast each surface region of a crystal grows. Empirical studies suggest less than 0.1% of snowflakes exhibit the ideal six-fold symmetric shape. Very occasionally twelve branched snowflakes are observed; they maintain the six-fold symmetry. Snowflakes form in a wide variety of intricate shapes, leading to the notion that "no two are alike". Although nearly-identical snowflakes have been made in laboratory, they are very unlikely to be found in nature. Initial
This Is How We Do "a sequel of sorts to both 'California Gurls', and 'Last Friday Night (T.G.I.F.)', Perry's previous party-hearty mega-hits." Lyrically, "This Is How We Do" finds Perry sing-talking about her hangout routine with her friends, also encouraging her fans to spend money they don't have just so they can have a good time, as noted by Stephen Thomas Erlewine of AllMusic. Empire claimed that on the song, Perry and her friends "are on the prowl for tacos and "hotties", "sucking really bad at Mariah Carey-oke". While also claiming that the song recalls her own 'Last Friday Night (T.G.I.F.)', Ben Ratliff of "The