Here are two large constructions you can make
from cardboard, which is a very cost-effective material that can
be surprisingly strong when assembled as an interconnected
structure. Like the wooden
geometric
sculptures, these activities result in visual
centerpieces, but are larger and use glued flaps instead of
cable ties, which make them easier for younger students.
These can be scaled much larger if desired for a very
impressive, yet affordable, activity. Everyone who sees
the result immediately understands that mathematics is essential
to the process of organizing the structure and working out the
lengths and angles. It provides an opportunity to point
out how math is valuable for all aspects of art, design,
architecture, and construction.