Obsession

This was my husband's birthday present from my sister. She has been developing an obsession with these cubes, and has two, three, four and five square cubes, as well as an octagonal shaped one. VERY confusing. My cousin is also obsessed, and his wife complains about entire Saturday nights spent watching 'speed cubing' on YouTube. We only own this 'two square' cube. But I fear my own obsession may be growing…