Constructionism views the world as being internally created through constructs, or internal models. We thus view the world through these constructs and which have significant and often unrealized effect on our perceptions.
There are two parts to a construction: the elements themselves and the connections/relationships between them. Construction can thus involve adding new elements or making new connections. Removing and changing are also options, as well as addition.
The idea of constructs goes back to Lao Tzu and Buddha and was picked up in more recent philosophy by Immanuel Kant, who noted the patterning in how we think and talked about 'categories' (which were precursors to schema).