We have explored the vast expanse of inorganic crystal space, encompassing an array of 10 10 compounds that span binary, ternary, and quaternary compounds. While the uncharted space may be considered infinite, we tame it by introducing chemical constraints in the form of filters and limits on stoichiometric combinations. We label the resulting entries as standard, missing, interesting and unlikely, according to whether they pass these filters and if they are present in the Materials Project database. This separates the proportion of discovered compounds that conform to standard chemical rules to form stable inorganic solids. Furthermore, we have visualised the inorganic crystal chemical space through the lens of these two filters, revealing that higher-order compounds exhibit pronounced distinctive characteristics. It hints that navigating complex spaces could unlock materials with novel properties in unexplored regions, offering new avenues for scientific exploration. The study thus serves as a foundational reference for future endeavours in data-driven materials discovery, emphasising the potential of unknown regions within the chemical space.