  We present a new teaching and outreach activity based around the construction
of a three-dimensional chart of isotopes using LEGO$^{\circledR}$ bricks. The
activity, \emph{Binding Blocks}, demonstrates nuclear and astrophysical
processes through a seven-meter chart of all nuclear isotopes, built from over
26,000 LEGO$^{\circledR}$ bricks. It integrates A-level and GCSE curricula
across areas of nuclear physics, astrophysics, and chemistry, including:
nuclear decays (through the colours in the chart); nuclear binding energy
(through tower heights); production of chemical elements in the cosmos; fusion
processes in stars and fusion energy on Earth; as well as links to medical
physics, particularly diagnostics and radiotherapy.

Physics Education;Nuclear Experiment;Nuclear Theory;Popular Physics