images 1+2 (from top): Â contours a stacked and laminated layers; trees are represented as thin dowels
images 3+4: Â contours are stacked but do not overlap fully (hollow underneath needing support; saves material)
images 5-6:  maya lin, systematic landscapes - contours created by vertical laminated panels; contours create by laminated horizontal layers   https://www.mayalinstudio.com/art/systematic-landscapes
images 7-8: contours created by vertical planes (without gaps (maya lin) and with gaps)
image 9: Â a more conceptual approach to model building (layering, material change, texturing of surfaces)