In this assignment, we had a started layer, sizes are given as a maximum. Then, we had three actions to generate two variations of this started plane: copy, extend and extrude. Above of all these objectives, I tried to place my layers by using proportion. I selected number 4 in order to obtain maximum square, then another layer which i used extrude is to generate cube. On the other hand, my extension’s length is 12 centimeters because of dividing 3 part as a 4 centimeters. Finally, I assembled all layers that they could be only perpendicular to each other.