You can form a cup-shaped Mirror Decoder from our flat, fan-shaped mirror simply by moistening along one straight edge of the mirror and overlapping the other straight edge about 1/4″. The mirror will stick to itself without glue or tape. For extra support you may wrap the mirror around a standard, smooth-sided paper or plastic cup (10 oz or 12 oz). The formed mirror (4″ tall) is perfectly scaled to decode our page-sized morphs. You’ll be extremely pleased with the picture-perfect quality reflections! To store mirrors until next use, just separate the straight edges, wipe dry gently and lay the mirrors flat.