To contend with these constraints, architects have worked to understand the right balance between in-situ materials and construction, and ex-situ to Mars.[7] For example, one idea is to use the locally available regolith to shield against radiation exposure, and another idea is to use transparent ice to allow non-harmful light to enter the habitat.[7] Mars habitat design can also involve the study of local conditions, including pressures, temperatures, and local materials, especially water.[7]