Building units include at least one microporous structure which permits the building units to connect with other building units or to another nonporous structure, such as a window or a wall in order to build a three dimensional structure. In some configurations the building units include a body, at least one surface having a nonporous structure, and at least one surface having an exposed microporous suction structure. Some embodiments also include a computing device such as a computer or television including a display device having a nonporous surface. The computing device generates a user interface to interact with the user. The user interface guides the user in constructing a three dimensional structure for the building units on a nonporous surface of the display device.
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