Where Does the Face Land?

A flat net can hide a cube. Six squares look still... then one fold sends a face to the back. Can you track where it lands without touching the paper?

First, choose one square as your anchor. Keep it facing you. Every square sharing a full edge with that anchor becomes an adjacent face. Picture each shared edge as a hinge. The neighbour swings up by a quarter-turn, while the anchor stays fixed. Now track faces one fold at a time. A square two steps away may wrap right around. Follow the connected edges; never jump across a gap. And do NOT mirror the picture in your head. Folding turns a face, but its corners keep their order around the square. Here is a useful check. Four faces can form a belt around the cube. In a straight strip of four squares, the first and third finish opposite, and the second and fourth finish opposite. Faces that meet along a cube edge are adjacent; faces that never meet are opposite.

Let's work through an example. A cube net has four squares in one horizontal row. From left to right they are blue A, yellow B, green C, and purple D. Red E sits directly above B. Orange F sits directly below B. When the net folds, which face is opposite yellow B? Start with yellow B as the anchor. Blue A, green C, red E, and orange F each share an edge with B. They all fold up beside it, so all four are adjacent to yellow. None can be the opposite face. Now watch the horizontal strip: A, B, C, D. Green C folds up along B's right edge. Purple D then folds over the far edge of C. It arrives behind B. The belt check agrees: B is second and D is fourth, so they are opposite. The answer is purple face D.

Anchor one face, fold neighbours around shared edges, and track each turn without mirroring. Check who meets and who cannot. You can now see the cube before it closes!