Grimm's Pentomino is a wooden game the uses 12 different shapes to build many different 2- and 3-dimensional designs. The pieces in this set come in a box with plexiglass lid.
Pentominoes are a type of "polyomino" (a geometric figure formed by joining one or more equal squares edge to edge). A Pentomino is defined as five congruent squares, connected along their edges (orthogonal connections). So each shape piece in this set is made up of 5 connected "squares" -- For instance, look at the "T" shape: the top (horizontal bar) of the T is 3 "squares," or units, and the vertical lower part of the T is 2 "squares." Of course you can't "see" the squares; you must imagine them. This can be done with the help of graph paper when introducing children to Pentomino. For instance, they can draw each Pentomino shape as a 2-dimensional representation on a piece of graph paper in order to understand the concept of the 5 squares.
Pentomino is a game that can be played by children and adults of many skill levels. Younger children can experiment with stacking the pieces and creating designs, in order to discover some of the properties of the blocks without necessarily following any "rules." As they are ready to start more formal understanding geometric concepts like symmetry, area, volume, perimeter and congruence, they can begin attempting to use the Pentomino pieces as they are designed.
The object of Pentomino is to create a rectangular two- or three-dimensional box in which the entire surface of the box is covered, without any overlaps or gaps (empty squares). Each of the 12 pentominoes has an area of 5 unit squares, so the box must have an area of 60 units. There are many ways to accomplish this goal, especially by flipping or rotating pieces. Some examples are shown in the photos above.
Made in Germany by Grimm's Spiel und Holz Design. Dimensions of set are about 5.9 x 10.6 inches (15 cm x 27 cm).