When linked to other observed phenomena such as gravity, sunsets, tides, eclipses, distances and other measurements that challenge the flat earth model, claimants replace commonly-accepted explanations with piecemeal models that distort or over-simplify how perspective, mass, buoyancy, light or other physical systems work.[43] These piecemeal replacements rarely conform with each other, finally leaving many flat-Earth claimants to agree that such phenomena remain "mysteries" and more investigation is to be done.