Abstract: A modelling assembly 1400 includes a plurality of releasably interconnectable parts, the parts including floor parts 1402 and wall parts 1408. The assembly 1400 includes a plurality of pegs 102, each of which, in an assembled condition, extends from one part to another part to hold the parts together, at least one of the parts defining a peg receiving hole 104 in which one of the pegs 102 is receivable.