If you look at a completed tessellation, you will see the original motif repeats in a pattern. One mathematical idea that can be emphasized through tessellations is symmetry. There are 17 possible ways that a pattern can be used to tile a flat surface or 'wallpaper'.
Related to liquidity: Liquidity ratio, Liquidity risk Liquidity In context of securities, a high level of trading activity, allowing buying and selling with minimum price disturbance.
Common liquidity ratios include the current ratio, the quick ratio and the operating cash flow ratio. Different analysts consider different assets to be relevant in calculating liquidity.