The riders then began the return journey to full size, but were soon greeted with the sight of water molecules swirling rapidly. The scientist sees this as a discovery and says: ""Ah, how strange! The molecules are so active now! They have become fluid – freed from their frozen state. That can only mean that the snowflake is melting!"" The riders saw molecules around them, moving faster as their temperature increased. The molecules were depicted in green and yellow, with occasional star-shaped flashes representing evaporation.